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9/22/2017 12:11:25 AM
Posted: 6/10/2003 5:30:09 AM EDT
Could I install a 11.5" Bushmaster Barrell into a Colt M-4 without encountering any problems?
Would a Bushmaster 11.5" Upper Receover Barrel Assembly mate with by Colt Lower Receiver?

Thank-You for your assistance.

Link Posted: 6/10/2003 9:35:41 AM EDT
If a bullet fed low it would slifde up the Colt extended ramp and catch oo the barrel extension of the Bushmaster barrel and cause a malfuction. Also Bushmaster does not sell 1/7 twist 11.5" barrels. If you want this you need to get a 14.5" 1/7 twist Bushamster barrel and cut it down to 11.5" and open the gas port up. Also while your at it you would cut in extended feed ramps to the barrel extension to match the Colt ramps on the receiver.
Link Posted: 6/10/2003 10:07:20 AM EDT
Anyone have any sources for 11.5" 1:7 Colt barrels?
Link Posted: 6/10/2003 10:15:31 AM EDT
SP62627 BARREL & FRONT SIGHT ASSY R0933 1/7 LWT - 11.5in CHROME LINED $450.00 [url]www.sawlesales.com[/url]
Link Posted: 6/10/2003 10:18:19 AM EDT
You might check out MSTN. They had some commando uppers some time back. Also TROY IND. HAS alot of bbls. and uppers of various lengths.
Link Posted: 6/14/2003 8:35:06 PM EDT
just make sure you have your approved ATF form for SBR, before mating the 11.5 inch upper to the lower.
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