Originally Posted By leid:
Originally Posted By LiquidG:
Originally Posted By js308:
Originally Posted By CAC01:
Originally Posted By AR-Rhino:
Hate to say it, but something is off on that SAW 6945. The barrel is cut way to close to the FSB. That looks like maybe 10.1 " versus 10.3"? You might want to pull the Flashider off and see if it is a cutdown 16" barrel. Factory barrels have a crisp 90 degree cut where the threads return/step into the barrel. Cut down barrels normally have a radiused cut. That might be why the Bayo lug is chopped in order to cut it down? Should have a bayo lug as all the Colt 10.3 MK 18's I have seen have one.
And you would be wrong...
The "SP" designation tells you it is a 10" barrel. NONE of the 6945/6946 (10.3 inch barrel) SBR's have a bayonet lug
. Colt is doing it right. If you can't put a bayonet onit, it doesn't need a bayonet lug.
I'm confused. There are pictures of a 6945 on page 2 showing a bayonet lug. What am i missing here?
Bayo lug = complete upper kit sold alone, NO bayo lug = complete rifle's
In the past all Colt 10.0 & 11.5" 5.56MM weapons/uppers/barrels had a shaved bayo lug. Current information from U.S. mil. personnel is that DOD orders all 10.3" weapons/uppers/barrels with a bayo lug. DOD may be looking for better parts commonality &/or an accessory attachment point. The Colt made-for-LE 10.3" weapons/uppers/barrels may or may not have a bayo lug. The complete 10.3" Colt weapons on display at 2012 SHOT were a mix with the Colt 10.3" SCW having a full bayo lug.
Additional info with some VERY nice old Colt AR-15s: http://www.ar15.com/forums/t_6_23/360580_Colt_Commando_and_Carbines.html
MK 18 and CQBR barrels retain the bayonet lug because the original CQBR project consisted of cut down 14.5" M4A1 barrels.
For whatever reason, Crane didn't bother cutting the bayonet lugs off - Colt was asked to produce the same barrels in a factory configuration. Crane left the bayonet lug - so Colt did as well.
For a while, SAW was offering "SP" (Special Purpose) versions of Colt rifles with 10.0" barrels with shaved bayonet lugs. "CQB" variants tend to refer to those using the CQBR/MK 18 barrel in 10.3" and "usually" have bayonet lugs - however, the 694x series uppers and folding front sight are not govered by any military specification, so sometimes have their bayonet lugs shaved off.
Generally speaking, Colt's policy has been "if it doesn't accept a bayonet then the bayonet lug gets removed" on commercial select fire offerings, however, some late XM177E2s also had bayonet lugs intact - though almost all of them seem to have gone to foreign sales (pictures are seen of them on Filipino XM177E2s as well as UK SAS).
The 10.3" barrel is an oddity because it is not a Colt commercial offering "per se," it was developed by NSWC-Crane, and Colt has only just begun "officially offering" the 10.3" barrel length - because the military ones retain the bayonet lug, some of the commercial ones do as well, but there doesn't seem to be a clear "parameter" yet of how 10.3" barrels are to be set up.