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My factory commando has no bayonet lug.
Factory MGs have *rarely* been neutered, then.
As with most things Colt, I guess you can never say never to any particular weird configuration.
It is a bit disappointing to see that the current knowledge base here has not corrected the above statement. Kudos to tgus for adding his credible information. Post pics of your COMMANDO when you have time. I truly enjoy looking at the first generation Colt AR-15s.They are works of art IMO. Here is my information based on 44 years of experience with the AR15/M16 platform. With Colt there are ALWAYS exceptions but there are guidelines. One of which follows & is very important when it comes to identifying genuine transferables from the earliest CAR-15 series thru the M4 series 10.0" & 11.5" carbines manufactured prior to the advent of the 10.3" MK18 carbine/upper/barrel. A factory Colt 10.0" or 11.5" Carbine/upper/barrel should normally have a SHAVED bayo lug as shown on the original factory Colt 10.0" & 11.5" M4 uppers below. The only non factory original Colt parts pictured are the CCH BUIS & the FH on the 10" M4 upper. If you come across an "all original" 10" or 11.5" Colt Carbine/upper/barrel with a standard bayo lug, your BS filter had better be working to figure out what you are actually looking at. Unfortunately, Colt violated this guideline with the MK18/694X series. Some genuine factory Colt MK18/694X series carbines/uppers/barrels have bayo lugs and some do not. This caveat had us scratching out heads until several current U.S. military guys shed some light on this. The information they provided is that the Colt 10.3" carbines/uppers/barrels ordered for Uncle Sam are ordered WITH a full bayo lug. This requirement may be an effort towards better parts commonality. The Colt 10.3" carbines/uppers/barrels manufactured for LE may or may not have a bayo lug. When I look at a DOD MK18, I now expect to see an intact bayo lug. And I have not been disappointed YET. But in time, Colt will throw us another curve. They already have but that does not apply to this thread. FWIW.
R635 SMG without bayonet lug
As far as the "general rule" for Colt commercial select-fire 5.56MM carbines is that the bayonet lug is omitted if the barrel cannot accept a bayonet. This has been true since the R605. 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).
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.
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.
Colt's current "commando" offering is the RO933 - an 11.5" .625 diameter barrel - with a shave bayonet lug. The MK 18 / M4A1 CQBR upper is uaully designated with a "CQB" suffix - but there doesn't seem to be a clear way of designating the 694x series of rifles - Colt, having long since offered a relatively simple set of model numbers - have now added the "CM" series and the "PO" series, and it will probably take them a while to iron everything out.
~Augee