diff --git a/addons/sourcemod/extensions/sendproxy.ext.2.tf2.so b/addons/sourcemod/extensions/sendproxy.ext.2.tf2.so
new file mode 100644
index 0000000..560031d
Binary files /dev/null and b/addons/sourcemod/extensions/sendproxy.ext.2.tf2.so differ
diff --git a/extension/AMBuildScript b/extension/AMBuildScript
new file mode 100644
index 0000000..1469bd3
--- /dev/null
+++ b/extension/AMBuildScript
@@ -0,0 +1,429 @@
+# vim: set sts=2 ts=8 sw=2 tw=99 et ft=python:
+import os, sys
+
+# Simple extensions do not need to modify this file.
+
+class SDK(object):
+  def __init__(self, sdk, ext, aDef, name, platform, dir):
+    self.folder = 'hl2sdk-' + dir
+    self.envvar = sdk
+    self.ext = ext
+    self.code = aDef
+    self.define = name
+    self.platform = platform
+    self.name = dir
+    self.path = None
+
+WinOnly = ['windows']
+WinLinux = ['windows', 'linux']
+WinLinuxMac = ['windows', 'linux', 'mac']
+
+PossibleSDKs = {
+  'episode1':  SDK('HL2SDK', '1.ep1', '1', 'EPISODEONE', WinLinux, 'episode1'),
+  'ep2':  SDK('HL2SDKOB', '2.ep2', '3', 'ORANGEBOX', WinLinux, 'orangebox'),
+  'css':  SDK('HL2SDKCSS', '2.css', '6', 'CSS', WinLinuxMac, 'css'),
+  'hl2dm':  SDK('HL2SDKHL2DM', '2.hl2dm', '7', 'HL2DM', WinLinuxMac, 'hl2dm'),
+  'dods': SDK('HL2SDKDODS', '2.dods', '8', 'DODS', WinLinuxMac, 'dods'),
+  'sdk2013': SDK('HL2SDK2013', '2.sdk2013', '9', 'SDK2013', WinLinuxMac, 'sdk2013'),
+  'tf2':  SDK('HL2SDKTF2', '2.tf2', '11', 'TF2', WinLinuxMac, 'tf2'),
+  'l4d':  SDK('HL2SDKL4D', '2.l4d', '12', 'LEFT4DEAD', WinLinuxMac, 'l4d'),
+  'nucleardawn': SDK('HL2SDKND', '2.nd', '13', 'NUCLEARDAWN', WinLinuxMac, 'nucleardawn'),
+  'l4d2': SDK('HL2SDKL4D2', '2.l4d2', '15', 'LEFT4DEAD2', WinLinuxMac, 'l4d2'),
+  'darkm':  SDK('HL2SDK-DARKM', '2.darkm', '2', 'DARKMESSIAH', WinOnly, 'darkm'),
+  'swarm':  SDK('HL2SDK-SWARM', '2.swarm', '16', 'ALIENSWARM', WinOnly, 'swarm'),
+  'bgt':  SDK('HL2SDK-BGT', '2.bgt', '4', 'BLOODYGOODTIME', WinOnly, 'bgt'),
+  'eye':  SDK('HL2SDK-EYE', '2.eye', '5', 'EYE', WinOnly, 'eye'),
+  'csgo': SDK('HL2SDKCSGO', '2.csgo', '20', 'CSGO', WinLinuxMac, 'csgo'),
+  'dota': SDK('HL2SDKDOTA', '2.dota', '21', 'DOTA', WinLinuxMac, 'dota'),
+  'portal2':  SDK('HL2SDKPORTAL2', '2.portal2', '17', 'PORTAL2', [], 'portal2'),
+  'blade':  SDK('HL2SDKBLADE', '2.blade', '18', 'BLADE', WinLinux, 'blade'),
+  'insurgency':  SDK('HL2SDKINSURGENCY', '2.insurgency', '19', 'INSURGENCY', WinLinuxMac, 'insurgency'),
+  'contagion':  SDK('HL2SDKCONTAGION', '2.contagion', '14', 'CONTAGION', WinOnly, 'contagion'),
+  'bms':  SDK('HL2SDKBMS', '2.bms', '10', 'BMS', WinLinux, 'bms'),
+}
+
+def ResolveEnvPath(env, folder):
+  if env in os.environ:
+    path = os.environ[env]
+    if os.path.isdir(path):
+      return path
+    return None
+
+  head = os.getcwd()
+  oldhead = None
+  while head != None and head != oldhead:
+    path = os.path.join(head, folder)
+    if os.path.isdir(path):
+      return path
+    oldhead = head
+    head, tail = os.path.split(head)
+
+  return None
+
+def Normalize(path):
+  return os.path.abspath(os.path.normpath(path))
+
+class ExtensionConfig(object):
+  def __init__(self):
+    self.sdks = {}
+    self.binaries = []
+    self.extensions = []
+    self.generated_headers = None
+    self.mms_root = None
+    self.sm_root = None
+
+  @property
+  def tag(self):
+    if builder.options.debug == '1':
+      return 'Debug'
+    return 'Release'
+
+  def detectSDKs(self):
+    sdk_list = builder.options.sdks.split(',')
+    use_all = sdk_list[0] == 'all'
+    use_present = sdk_list[0] == 'present'
+
+    for sdk_name in PossibleSDKs:
+      sdk = PossibleSDKs[sdk_name]
+      if builder.target_platform in sdk.platform:
+        if builder.options.hl2sdk_root:
+          sdk_path = os.path.join(builder.options.hl2sdk_root, sdk.folder)
+        else:
+          sdk_path = ResolveEnvPath(sdk.envvar, sdk.folder)
+        if sdk_path is None or not os.path.isdir(sdk_path):
+          if use_all or sdk_name in sdk_list:
+            raise Exception('Could not find a valid path for {0}'.format(sdk.envvar))
+          continue
+        if use_all or use_present or sdk_name in sdk_list:
+          sdk.path = Normalize(sdk_path)
+          self.sdks[sdk_name] = sdk
+
+    if len(self.sdks) < 1:
+      raise Exception('At least one SDK must be available.')
+
+    if builder.options.sm_path:
+      self.sm_root = builder.options.sm_path
+    else:
+      self.sm_root = ResolveEnvPath('SOURCEMOD18', 'sourcemod-1.8')
+      if not self.sm_root:
+        self.sm_root = ResolveEnvPath('SOURCEMOD', 'sourcemod')
+      if not self.sm_root:
+        self.sm_root = ResolveEnvPath('SOURCEMOD_DEV', 'sourcemod-central')
+
+    if not self.sm_root or not os.path.isdir(self.sm_root):
+      raise Exception('Could not find a source copy of SourceMod')
+    self.sm_root = Normalize(self.sm_root)
+
+    if builder.options.mms_path:
+      self.mms_root = builder.options.mms_path
+    else:
+      self.mms_root = ResolveEnvPath('MMSOURCE110', 'mmsource-1.10')
+      if not self.mms_root:
+        self.mms_root = ResolveEnvPath('MMSOURCE', 'metamod-source')
+      if not self.mms_root:
+        self.mms_root = ResolveEnvPath('MMSOURCE_DEV', 'mmsource-central')
+
+    if not self.mms_root or not os.path.isdir(self.mms_root):
+      raise Exception('Could not find a source copy of Metamod:Source')
+    self.mms_root = Normalize(self.mms_root)
+
+  def configure(self):
+    cxx = builder.DetectCompilers()
+
+    if cxx.like('gcc'):
+      cxx.defines += [
+        'stricmp=strcasecmp',
+        '_stricmp=strcasecmp',
+        '_snprintf=snprintf',
+        '_vsnprintf=vsnprintf',
+        'HAVE_STDINT_H',
+        'GNUC',
+      ]
+      cxx.cflags += [
+        '-pipe',
+        '-fno-strict-aliasing',
+        '-Wall',
+        '-Werror',
+        '-Wno-unused',
+        '-Wno-switch',
+        '-Wno-array-bounds',
+        '-msse',
+        '-m32',
+      ]
+      cxx.cxxflags += [
+        '-std=c++11',
+      ]
+
+      have_gcc = cxx.vendor == 'gcc'
+      have_clang = cxx.vendor == 'clang'
+      if have_clang or (have_gcc and cxx.version >= '4'):
+        cxx.cflags += ['-fvisibility=hidden']
+        cxx.cxxflags += ['-fvisibility-inlines-hidden']
+        if have_clang or (have_gcc and cxx.version >= '4.6'):
+          cxx.cflags += ['-Wno-narrowing']
+        if (have_gcc and cxx.version >= '4.7') or (have_clang and cxx.version >= '3'):
+          cxx.cxxflags += ['-Wno-delete-non-virtual-dtor']
+        if have_gcc and cxx.version >= '4.8':
+          cxx.cflags += ['-Wno-unused-result']
+      if have_clang:
+        cxx.cxxflags += ['-Wno-implicit-exception-spec-mismatch']
+        if cxx.version >= 'apple-clang-5.1' or cxx.version >= 'clang-3.4':
+          cxx.cxxflags += ['-Wno-deprecated-register']
+        else:
+          cxx.cxxflags += ['-Wno-deprecated']
+        cxx.cflags += ['-Wno-sometimes-uninitialized']
+
+      cxx.linkflags += ['-m32']
+      cxx.cxxflags += [
+        '-fno-exceptions',
+        '-fno-threadsafe-statics',
+        '-Wno-non-virtual-dtor',
+        '-Wno-overloaded-virtual',
+      ]
+
+      if have_gcc:
+        cxx.cflags += ['-mfpmath=sse']
+    elif cxx.vendor == 'msvc':
+      if builder.options.debug == '1':
+        cxx.cflags += ['/MTd']
+        cxx.linkflags += ['/NODEFAULTLIB:libcmt']
+      else:
+        cxx.cflags += ['/MT']
+      cxx.defines += [
+        '_CRT_SECURE_NO_DEPRECATE',
+        '_CRT_SECURE_NO_WARNINGS',
+        '_CRT_NONSTDC_NO_DEPRECATE',
+        '_ITERATOR_DEBUG_LEVEL=0',
+      ]
+      cxx.cflags += [
+        '/W3',
+      ]
+      cxx.cxxflags += [
+        '/EHsc',
+        '/GR-',
+        '/TP',
+      ]
+      cxx.linkflags += [
+        '/MACHINE:X86',
+        'kernel32.lib',
+        'user32.lib',
+        'gdi32.lib',
+        'winspool.lib',
+        'comdlg32.lib',
+        'advapi32.lib',
+        'shell32.lib',
+        'ole32.lib',
+        'oleaut32.lib',
+        'uuid.lib',
+        'odbc32.lib',
+        'odbccp32.lib',
+      ] 
+
+    # Optimization
+    if builder.options.opt == '1':
+      cxx.defines += ['NDEBUG']
+      if cxx.like('gcc'):
+        cxx.cflags += ['-O3']
+      elif cxx.like('msvc'):
+        cxx.cflags += ['/Ox', '/Zo']
+        cxx.linkflags += ['/OPT:ICF', '/OPT:REF']
+
+    # Debugging
+    if builder.options.debug == '1':
+      cxx.defines += ['DEBUG', '_DEBUG']
+      if cxx.like('msvc'):
+        cxx.cflags += ['/Od', '/RTC1']
+
+    # This needs to be after our optimization flags which could otherwise disable it.
+    if cxx.vendor == 'msvc':
+      # Don't omit the frame pointer.
+      cxx.cflags += ['/Oy-']
+
+    # Platform-specifics
+    if builder.target_platform == 'linux':
+      cxx.defines += ['_LINUX', 'POSIX']
+      cxx.linkflags += ['-lm']
+      if cxx.vendor == 'gcc':
+        cxx.linkflags += ['-static-libgcc']
+      elif cxx.vendor == 'clang':
+        cxx.linkflags += ['-lgcc_eh']
+    elif builder.target_platform == 'mac':
+      cxx.defines += ['OSX', '_OSX', 'POSIX']
+      cxx.cflags += ['-mmacosx-version-min=10.5']
+      cxx.linkflags += [
+        '-mmacosx-version-min=10.5',
+        '-arch', 'i386',
+        '-lstdc++',
+        '-stdlib=libstdc++',
+      ]
+      cxx.cxxflags += ['-stdlib=libstdc++']
+    elif builder.target_platform == 'windows':
+      cxx.defines += ['WIN32', '_WINDOWS']
+
+    # Finish up.
+    cxx.includes += [
+      os.path.join(self.sm_root, 'public'),
+    ]
+	
+  def ConfigureForHL2(self, binary, sdk):
+    compiler = binary.compiler
+
+    if sdk.name == 'episode1':
+      mms_path = os.path.join(self.mms_root, 'core-legacy')
+    else:
+      mms_path = os.path.join(self.mms_root, 'core')
+
+    compiler.cxxincludes += [
+      os.path.join(mms_path),
+      os.path.join(mms_path, 'sourcehook'),
+    ]
+
+    defines = ['SE_' + PossibleSDKs[i].define + '=' + PossibleSDKs[i].code for i in PossibleSDKs]
+    compiler.defines += defines
+
+    paths = [
+      ['public'],
+      ['public', 'engine'],
+      ['public', 'mathlib'],
+      ['public', 'vstdlib'],
+      ['public', 'tier0'],
+      ['public', 'tier1']
+    ]
+    if sdk.name == 'episode1' or sdk.name == 'darkm':
+      paths.append(['public', 'dlls'])
+      paths.append(['game_shared'])
+    else:
+      paths.append(['public', 'game', 'server'])
+      paths.append(['public', 'toolframework'])
+      paths.append(['game', 'shared'])
+      paths.append(['common'])
+
+    compiler.defines += ['SOURCE_ENGINE=' + sdk.code]
+
+    if sdk.name in ['sdk2013', 'bms'] and compiler.like('gcc'):
+      # The 2013 SDK already has these in public/tier0/basetypes.h
+      compiler.defines.remove('stricmp=strcasecmp')
+      compiler.defines.remove('_stricmp=strcasecmp')
+      compiler.defines.remove('_snprintf=snprintf')
+      compiler.defines.remove('_vsnprintf=vsnprintf')
+
+    if compiler.like('msvc'):
+      compiler.defines += ['COMPILER_MSVC', 'COMPILER_MSVC32']
+    else:
+      compiler.defines += ['COMPILER_GCC']
+
+    # For everything after Swarm, this needs to be defined for entity networking
+    # to work properly with sendprop value changes.
+    if sdk.name in ['blade', 'insurgency', 'csgo', 'dota']:
+      compiler.defines += ['NETWORK_VARS_ENABLED']
+
+    if sdk.name in ['css', 'hl2dm', 'dods', 'sdk2013', 'bms', 'tf2', 'l4d', 'nucleardawn', 'l4d2', 'dota']:
+      if builder.target_platform in ['linux', 'mac']:
+        compiler.defines += ['NO_HOOK_MALLOC', 'NO_MALLOC_OVERRIDE']
+
+    if sdk.name == 'csgo' and builder.target_platform == 'linux':
+      compiler.linkflags += ['-lstdc++']
+
+    for path in paths:
+      compiler.cxxincludes += [os.path.join(sdk.path, *path)]
+
+    if builder.target_platform == 'linux':
+      if sdk.name == 'episode1':
+        lib_folder = os.path.join(sdk.path, 'linux_sdk')
+      elif sdk.name in ['sdk2013', 'bms']:
+        lib_folder = os.path.join(sdk.path, 'lib', 'public', 'linux32')
+      else:
+        lib_folder = os.path.join(sdk.path, 'lib', 'linux')
+    elif builder.target_platform == 'mac':
+      if sdk.name in ['sdk2013', 'bms']:
+        lib_folder = os.path.join(sdk.path, 'lib', 'public', 'osx32')
+      else:
+        lib_folder = os.path.join(sdk.path, 'lib', 'mac')
+
+    if builder.target_platform in ['linux', 'mac']:
+      if sdk.name in ['sdk2013', 'bms']:
+        compiler.postlink += [
+          compiler.Dep(os.path.join(lib_folder, 'tier1.a')),
+          compiler.Dep(os.path.join(lib_folder, 'mathlib.a'))
+        ]
+      else:
+        compiler.postlink += [
+          compiler.Dep(os.path.join(lib_folder, 'tier1_i486.a')),
+          compiler.Dep(os.path.join(lib_folder, 'mathlib_i486.a'))
+        ]
+
+      if sdk.name in ['blade', 'insurgency', 'csgo', 'dota']:
+        compiler.postlink += [compiler.Dep(os.path.join(lib_folder, 'interfaces_i486.a'))]
+
+    dynamic_libs = []
+    if builder.target_platform == 'linux':
+      if sdk.name in ['css', 'hl2dm', 'dods', 'tf2', 'sdk2013', 'bms', 'nucleardawn', 'l4d2']:
+        dynamic_libs = ['libtier0_srv.so', 'libvstdlib_srv.so']
+      elif sdk.name in ['l4d', 'blade', 'insurgency', 'csgo', 'dota']:
+        dynamic_libs = ['libtier0.so', 'libvstdlib.so']
+      else:
+        dynamic_libs = ['tier0_i486.so', 'vstdlib_i486.so']
+    elif builder.target_platform == 'mac':
+      compiler.linkflags.append('-liconv')
+      dynamic_libs = ['libtier0.dylib', 'libvstdlib.dylib']
+    elif builder.target_platform == 'windows':
+      libs = ['tier0', 'tier1', 'vstdlib', 'mathlib']
+      if sdk.name in ['swarm', 'blade', 'insurgency', 'csgo', 'dota']:
+        libs.append('interfaces')
+      for lib in libs:
+        lib_path = os.path.join(sdk.path, 'lib', 'public', lib) + '.lib'
+        compiler.linkflags.append(compiler.Dep(lib_path))
+
+    for library in dynamic_libs:
+      source_path = os.path.join(lib_folder, library)
+      output_path = os.path.join(binary.localFolder, library)
+
+      def make_linker(source_path, output_path):
+        def link(context, binary):
+          cmd_node, (output,) = context.AddSymlink(source_path, output_path)
+          return output
+        return link
+
+      linker = make_linker(source_path, output_path)
+      compiler.linkflags[0:0] = [compiler.Dep(library, linker)]
+
+    return binary
+
+  def ConfigureForExtension(self, context, compiler):
+    compiler.cxxincludes += [
+      os.path.join(context.currentSourcePath),
+      os.path.join(context.currentSourcePath, 'sdk'),
+      os.path.join(self.sm_root, 'public'),
+      os.path.join(self.sm_root, 'public', 'extensions'),
+      os.path.join(self.sm_root, 'sourcepawn', 'include'),
+      os.path.join(self.sm_root, 'public', 'amtl', 'include'),
+
+      # Remove when upgraded to SM 1.8
+      os.path.join(self.sm_root, 'public', 'sourcepawn'),
+    ]
+    return compiler
+
+  def HL2Project(self, context, name):
+    project = context.compiler.LibraryProject(name)
+    self.ConfigureForExtension(context, project.compiler)
+    return project
+	
+  def HL2Config(self, project, name, sdk):
+    binary = project.Configure(name, '{0} - {1}'.format(self.tag, sdk.name))
+    return self.ConfigureForHL2(binary, sdk)
+
+Extension = ExtensionConfig()
+Extension.detectSDKs()
+Extension.configure()
+
+# Add additional buildscripts here
+BuildScripts = [
+  'AMBuilder',
+]
+
+if builder.backend == 'amb2':
+  BuildScripts += [
+    'PackageScript',
+  ]
+
+builder.RunBuildScripts(BuildScripts, { 'Extension': Extension})
diff --git a/extension/AMBuilder b/extension/AMBuilder
new file mode 100644
index 0000000..007eb95
--- /dev/null
+++ b/extension/AMBuilder
@@ -0,0 +1,31 @@
+# vim: set sts=2 ts=8 sw=2 tw=99 et ft=python:
+import os, sys
+
+projectName = 'sendproxy'
+
+# smsdk_ext.cpp will be automatically added later
+sourceFiles = [
+  'extension.cpp',
+]
+
+###############
+# Make sure to edit PackageScript, which copies your files to their appropriate locations
+# Simple extensions do not need to modify past this point.
+
+project = Extension.HL2Project(builder, projectName + '.ext')
+
+if os.path.isfile(os.path.join(builder.currentSourcePath, 'sdk', 'smsdk_ext.cpp')):
+  # Use the copy included in the project
+  project.sources += [os.path.join('sdk', 'smsdk_ext.cpp')]
+else:
+  # Use the copy included with SM 1.6 and newer
+  project.sources += [os.path.join(Extension.sm_root, 'public', 'smsdk_ext.cpp')]
+
+project.sources += sourceFiles
+  
+for sdk_name in Extension.sdks:
+  sdk = Extension.sdks[sdk_name]
+  
+  binary = Extension.HL2Config(project, projectName + '.ext.' + sdk.ext, sdk)
+
+Extension.extensions = builder.Add(project)
diff --git a/extension/PackageScript b/extension/PackageScript
new file mode 100644
index 0000000..18aea65
--- /dev/null
+++ b/extension/PackageScript
@@ -0,0 +1,52 @@
+# vim: set ts=8 sts=2 sw=2 tw=99 et ft=python:
+import os
+
+# This is where the files will be output to
+# package is the default
+builder.SetBuildFolder('package')
+
+# Add any folders you need to this list
+folder_list = [
+  #'addons/sourcemod/extensions',
+  #'addons/sourcemod/scripting/include',
+  #'addons/sourcemod/gamedata',
+  #'addons/sourcemod/configs',
+]
+
+# Create the distribution folder hierarchy.
+folder_map = {}
+for folder in folder_list:
+  norm_folder = os.path.normpath(folder)
+  folder_map[folder] = builder.AddFolder(norm_folder)
+
+# Do all straight-up file copies from the source tree.
+def CopyFiles(src, dest, files):
+  if not dest:
+    dest = src
+  dest_entry = folder_map[dest]
+  for source_file in files:
+    source_path = os.path.join(builder.sourcePath, src, source_file)
+    builder.AddCopy(source_path, dest_entry)
+
+# Include files 
+#CopyFiles('include', 'addons/sourcemod/scripting/include',
+#  [ 'sample.inc', ]
+#)
+
+# GameData files
+#CopyFiles('gamedata', 'addons/sourcemod/gamedata',
+#  [ 'myfile.txt',
+#  'file2.txt'
+#  ]
+#)
+
+# Config Files
+#CopyFiles('configs', 'addons/sourcemod/configs',
+#  [ 'configfile.cfg',
+#  'otherconfig.cfg,
+#  ]
+#)
+
+# Copy binaries.
+#for cxx_task in Extension.extensions:
+#  builder.AddCopy(cxx_task.binary, folder_map['addons/sourcemod/extensions'])
diff --git a/extension/configure.py b/extension/configure.py
new file mode 100644
index 0000000..d6ee1c4
--- /dev/null
+++ b/extension/configure.py
@@ -0,0 +1,23 @@
+# vim: set sts=2 ts=8 sw=2 tw=99 et:
+import sys
+from ambuild2 import run
+
+# Simple extensions do not need to modify this file.
+
+builder = run.PrepareBuild(sourcePath = sys.path[0])
+
+builder.options.add_option('--hl2sdk-root', type=str, dest='hl2sdk_root', default='../../../hl2sdk',
+		                   help='Root search folder for HL2SDKs')
+builder.options.add_option('--mms-path', type=str, dest='mms_path', default='../../../metamod-source-1.10',
+                       help='Path to Metamod:Source')
+builder.options.add_option('--sm-path', type=str, dest='sm_path', default='../../../sourcemod-1.7',
+                       help='Path to SourceMod')
+builder.options.add_option('--enable-debug', action='store_const', const='1', dest='debug',
+                       help='Enable debugging symbols')
+builder.options.add_option('--enable-optimize', action='store_const', const='1', dest='opt',
+                       help='Enable optimization')
+builder.options.add_option('-s', '--sdks', default='tf2', dest='sdks',
+                       help='Build against specified SDKs; valid args are "all", "present", or '
+                            'comma-delimited list of engine names (default: %default)')
+
+builder.Configure()