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Posted: 5/6/2009 1:49:46 PM EDT
Hi, Does anyone know if a Bushmaster lower requires a Mil-spec buffer tube or a commercial buffer tube?? I thought it was a Mil-spec tube, but want to make 100% sure. I am putting on a Magpul CTR stock and have to find the correct stock and buffer tube to order. They have both Mil-spec and commercial versions available. Thank you in advance!!
VP
Link Posted: 5/6/2009 1:51:54 PM EDT
[#1]
Commercial
Link Posted: 5/6/2009 2:01:37 PM EDT
[#2]
+1 Commercial size from the info here in previous threads.

The outside diameter of the commercial tubes should be 1.17" compared to the mil-spec size tubes' 1.14" OD.

Here's Magpul's CTR buffer tube ID info link.


http://www.magpul.com/pdfs/technotes/ctr/buffertubeid.pdf


Link Posted: 5/6/2009 3:57:45 PM EDT
[#3]
Does a commercial buffer tube have 6 holes/indents on the bottom? or is it supposed to have 4 holes/indents on the underside of the tube? My tube has 6 holes/indents and does not slide back and fourth with the Magpul CTR stock I have. It only will lock on the first hole/indent. I think I may have got the Mil spec CTR stock and a commercial buffer. Please let me know if anyone else has had this problem. Thanks
Link Posted: 5/6/2009 4:03:38 PM EDT
[#4]
Bushmaster's come from the factory with commercial tubes.  Both mil-spec an comm. come in 4 and 6 position.  You can replace the comm. tube with a mil-spec one on your rifle.  The threading is the same.  If you are keeping the orig. tube, and just buying the stock, you need to buy the comm. size one.
Link Posted: 5/6/2009 4:50:32 PM EDT
[#5]
Quoted:
Bushmaster's come from the factory with commercial tubes.  Both mil-spec an comm. come in 4 and 6 position.  You can replace the comm. tube with a mil-spec one on your rifle.  The threading is the same.  If you are keeping the orig. tube, and just buying the stock, you need to buy the comm. size one.


as well as 5 position
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