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Senior Moderator
(Milsurp Forums)
I do not believe the 10.5" is the correct length barrel for an XM-177 clone. Also, with the 10.5" barrel you can't use an XM-177 flash hider to obtain a 16" overall barrel length. The XM-177 flash hider is 5.5" so the correct length would need to be 11.5". Also, 11.5" does not require a gas port size change where the 10.5 may or may not. As for the bird cage flash hider not having the umpf to create enough allow the gas system to work correctly I don't see any issues with using one. That is what mine has. The way mine is set up it functions flawlessly with a standard run of the mill Colt SP1 bolt. My Commando's issues are because of a malfunctioning bolt not a gas port size. If it were then it would not run any better no matter what bolt it had in it.
Bill Hollinger
"We're surrounded, that simplifies our problem!"
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04-28-2014 09:31 PM
# ADS
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Head Moderator
(Founding Partner)
Site Founder
Check your math, Bill.
10.5 + 5.5 = 16. 11.5 + 5.5 = 17. 
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Legacy Member
Your need at least 1/2 inch overlap for the threads. A %.5 on a 10.5 comes up 1/2 inch short.
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Thank You to imarangemaster For This Useful Post:
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Head Moderator
(Founding Partner)
Site Founder
Originally Posted by
imarangemaster
Your need at least 1/2 inch overlap for the threads. A %.5 on a 10.5 comes up 1/2 inch short.
Ah, of course.
Is there a longer original style flash suppressor available? I've seen XM177 clones on US boards described as having 10.5" barrels.
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Senior Moderator
(Milsurp Forums)
Sorry, forgot to mention the .5 of threads. 
Bill Hollinger
"We're surrounded, that simplifies our problem!"
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Senior Moderator
(Milsurp Forums)
Found this picture that shows the 4.5" and 5.5". The 4.5" being the genuine XM177 "moderator" and the 5.5" being commercial.
Bill Hollinger
"We're surrounded, that simplifies our problem!"
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Head Moderator
(Founding Partner)
Site Founder
That commercial one looks just over 5".
Must be used on an 11.5" to avoid the tax man, then?
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Senior Moderator
(Milsurp Forums)
Yeah, I don't know for sure however I did find that the XM177 "moderator" is actually classified as a suppressor and requiring registration and the "tax man"!
Bill Hollinger
"We're surrounded, that simplifies our problem!"
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Advisory Panel
Originally Posted by
Bill Hollinger
the XM177 "moderator" is actually classified as a suppressor
That's true, even stated in the book, The Black Rifle, I think. That's why they had to stop shipping the little moderators out of country.
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Head Moderator
(Founding Partner)
Site Founder
Historical interest aside and for a shooter, I think I'd rather have an 14.5" with an A2 on it. More velocity in pretty much the same size package without the excessive blast and flash.
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PM
