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1/25/2018 7:38:29 AM
Posted: 12/7/2001 5:59:19 AM EST
[Last Edit: 12/7/2001 6:02:59 AM EST by Flashbang1]
I chopped my 16" M4 barrel down about a inch and re-threaded it to give it a overall length of 16" including the permanently installed KK Tac brake.
What is the standard 16” barrel gas port diameter, and do I need to enlarge the gas port to a size in-between the 16” barrel and the 14.5” barrel gas port?
Link Posted: 12/7/2001 9:08:32 AM EST
No - you don't need to open up the gas port for that. Its only when the barrel goes down to about 11.5" or shorter with only a birdcage or 3-prong on the end that you may have problems which require the gas port to be opened up a bit. I've had a number of 11.5" uppers and all have run fine with no mods to the gas port (but the extractor springs and buffer in a full auto shorty... well now, thats a different story...)
Link Posted: 12/7/2001 9:57:49 AM EST
I wouldn't mess with the gas port opening, I spoke with Tom Barr of Bushmaster about it, and from my conversation, it seem that the opening is real precise. If you mess it up, it could cost you a bunch to fix it.
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