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Posted: 5/21/2017 9:21:08 AM EDT
[#1]
Quote HistoryQuoted:
Yes, the barrel should be cylindrical. You could have a longer barrel cut down, but it needs to be a carbine length gas system and pencil (lightweight) profile. A rifle barrel or m4 barrel wouldn't work. For my XM177E2 build, I had a 16 inch Colt SP1 Carbine barrel cut down. also , are the 11.5 or 10.5 inches from chamber to the end of the thread ?? i mean , overall lenght or without the chamber or thread?? |
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Posted: 5/21/2017 9:48:43 AM EDT
[#2]
Quote HistoryQuoted:
asking that because i have seen some brownells bbls with a cone before the thread also , are the 11.5 or 10.5 inches from chamber to the end of the thread ?? i mean , overall lenght or without the chamber or thread?? The XM177E2 had an 11.5 inch barrel, this is measured the face of the bolt while locked in the chamber to the end of the muzzle of the barrel. ETA: https://www.ar15.com/forums/t_3_123/710202_XM177E2-Barrel-Markings--pictures-added-.html link to some barrel information with pictures |
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Posted: 5/31/2017 8:37:41 PM EDT
[#3]
just another question .......i have find out that the xm177e2 receiver i have , says "5.56 mm " , shouldn`t the bbl be 1/7 since 5.56 bullets stabilize in 1/7 bbls ?
maybe i am confused with the 5,56 ss109 round ?? was the xm177 e2 ever manufactured with a 1/7 bbl twist ? thanks ! |
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Posted: 5/31/2017 8:44:33 PM EDT
[#4]
Quote HistoryQuoted:
just another question .......i have find out that the xm177e2 receiver i have , says "5.56 mm " , shouldn`t the bbl be 1/7 since 5.56 bullets stabilize in 1/7 bbls ? maybe i am confused with the 5,56 ss109 round ?? was the xm177 e2 ever manufactured with a 1/7 bbl twist ? thanks ! 55gr 5.56 is the standard. 1/7 twist is more modern than retro, and is optimized for 62gr 5.56. |
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Posted: 6/1/2017 12:12:45 AM EDT
[#5]
Yes 5,56 is the the 62 grain SS109 round you're thinking of, however the original 5,56 was a 55 grain projectile designated M193. It predates the SS109 round developed by FN by a minimum of 15 years.
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Posted: 6/1/2017 6:36:14 AM EDT
[#6]
ohhh ok !!! , sorry for my ignorance , i didn`t know 5,56 came in 55 gr .....i thought only 223 came in that flavor .....
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