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Posted: 8/16/2006 3:40:34 PM EDT
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Ok, I've been through the tacked posts but I still have some questions. For a '67-'70 era XM177 Army issue build, it appears I need a 11.5" barrel and 4.5" dissipator. A1 upper (obviously) with no deflector. So, regarding barrel diameter, pencil/lightweight profile is correct? Grenade ring or no? And while I am throwing questions out, at what point did the barrel diameter increase? TIA PS The supplier threads seem adequate but, FWIW, I think the spec pages are becoming unwieldy (just an observation) YMMV |
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Thanks for the help, guys. Regarding the grenade ring, though, in looking through the real Nam photos, it looks like half and half - some with the ring and some w/o it. The Model 609/610 XM177 appears not to have a ring (then again it looks to be a slabside). The XM177E2 has one. I assume this just reflects overlap in issue models...? ETA 609 change |
| All XM177E2 rifles had the grenade ring (AFAIK). The XM177E1 had a 10.25"(?) barrel and just the moderator, no grenade ring. I even have a pic of XM177E2's with birdcage FH's and the grenade ring. But yeah, I got a question for UXB: what's the total length for that E2? Is it around 30"? |
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I used the LW barrel from Bushy I got from PK Firearms. I ordered the grenade ring from total silence & the dummy Mod. directly from BM. Sent it all off to www.ar15barrels.com and let him deal with the overall legal length of 16" issue. I would recommend the TS Mod instead of the bushy. It cost more, but I think it's historically more accurate. It has flats for the wrench. The BM is just round. I'm going to have mine re-done with the TS. Now you need to find the A1 upper receiver w/out brass deflector if you don't already have it. In my opinion, if your going to go through the trouble of building one, you might as well do it as historically accurate as you can. This would include refinishing the receivers. The standard XM177E1 (no grenade ring) is shorter than 16". All this in moot if your going SBR. XM177E2 
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JoeBud, The barrel started as a Colt post-ban carbine barrel, chopped and threaded to 11.5" with the gas port opened to 0.085". Grenade ring and moderator courtesy of Total Silence, Inc. Blanco Diablo, the overall length is exactly 30" with stock retracted and 33.25" with stock extended. |
That grunt obviously did not consult the Retro Guidelines! 
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That's what happens when I'm posting late at night and in a hurry. 
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How are you getting 16 inches with a 11.5" bbl? |
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Is the "lock-washer" from TS used with an XM177E1 retro-build or with the grenade-ring on an XM177E2 retro-build ? .....or should it be disregarded/left off of the build ? ..........what about when using cut-down light-weight barrels ? Regards, RichardS. [email protected] |
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