Upper Receiver Group, Colt M4-SP, Suppressed, Special-Order

ALL suppressed upper receiver groups are now special order only. 

This Colt 10 inch Special Purpose (SP) upper receiver group was designed for SUPPRESSED-ONLY applications.
The Colt custom barrel is machined with high precision bore concentricity and class 3A threads (US Military threads are class 2A - looser)
WARNING:  This upper rec group will NOT function without its sound suppressor installed!

This item includes all SA Reliability Package mods for suppressed use.

Does NOT contain the bolt group or charging handle.  

Upper Receiver:  Colt "Square" forging symbol - No further markings or CAGE markings: 13629 (Dot Matrix)
Barrel: Colt early production stamped C MP 5.56 NATO 1/7 (Double Line), with all SA Reliability Package mods.
Standard Sling Swivel (bottom) - (NOT the side sling mount in the photo.)
Colt M4 military handguards - double heat-shield
Colt removable carry handle assy - "Square" forging symbol.  (NOT the MaTech sight in the photo.)

Bolt Group Upgrade with Charging Handle Assembly

X Buffer Assy required.

NOTE:  Photo shows an original GEMTECH (Idaho) titanium GMT-556LE sound suppressor which is NOT included.
These custom Colt upper receiver groups are precision threaded to your exact silencer or muzzle adapter.

WE WILL NOT WORK WITH ANY SILENCER WHICH HAS A HOLE MACHINED THROUGH THE THREADS -
Under any circumstances.