Quote History Quoted:
XM177 is slick side upper with 10" barrel
XM177E1 is forward assist upper with 10" barrel
XM177E2 is forward assist upper with 11.5" barrel
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Quoted:
Then it wouldn't be an XM177.
I'm not doing a E1
because you cannot get a proper moderator, which you'd want on a 10" barrel to make sure you have reliable function. So it's going to be an E2 if that's the route I go.
I'm pretty sure I need to do the XM177 because of being former Army.
XM177 is slick side upper with 10" barrel
XM177E1 is forward assist upper with 10" barrel
XM177E2 is forward assist upper with 11.5" barrel
As far as I know the XM177 was only an air force carbine. The USAF didn't believe in the need for a forward assist so they had the slick side upper with the 10" barrel (XM177) and designated it as the GAU-5/A.
The XM177E1 was the forward assist army version and was stamped COMMANDO. It was identical to the GAU-5/A except for the forward assist. The E2 was army issue and used the 11.5" bbl. From what I've read on this, many E1s were rebarrelled and armorers over stamped the 1 with a 2.
Of course over time carbines were repaired and parts mixed up a bit so there's some confusion, especially with the USAF guns. They have a few different designations over time as parts were swapped out as policies changed over the years.
Anyway, this is what I believe to be correct. If I'm wrong please advise.