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Posted: 11/25/2004 3:16:14 PM EDT
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I am looking into getting a colt SP-1 upper ( small hole ). Will a standard Bush or RRA lower work with this? If not what to do? Thanks Joehinking.gif |
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If you in fact end up with an SP1 upper, with the large hole, the best way to mate it to a small hole lower is NOT the unit sold by Bushmaster, and almost everyone else. It's a total PITA to use, because every time you open the action it rotated out of position, and you have to use two screwdrivers to reset it. The only adapter I've found that stays in position is the unit sold by CDNN www.cdnninvestments.com Part #TAR2 |
WOW That is a good lookin' carbine you have there! |
Only two possibilities: - they're wrong, and it's a large-hole upper - it's not an SP1 upper, but an M16 or M16A1 upper (the latter will have a forward assist) -Troy |
I ordered one and it's in fact small hole. I guess they just didn't want to admit that it's a M16 upper. |
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As the bolt carrier is one of the 6 items that are used in M16's, it cannot be installed in an AR-15 because BATF clearly states "that if a AR15 type rifle contains even ONE M16 component, it is a machine gun". This is a ruling and is clearly stated in BATF bulletins and the Bushmaster sales catalog This was a quote I got off gunbroker.com, Is the SP-1 (M-16) upper totally legal that I got from CDNN? Joe |
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The "quote" off another web site hardly qualifies as an authoritative source. In fact it, and the overblown comments in the Bushmaster catalog, are largely (though not completely), BS. Your upper assy is perfectly legal. And most, but not all, of us believe that an M16 bolt carrier is also legal. It's the installation of full auto parts into the LOWER that can get you on trouble. (And how many tomes a week do we have to go through this rigamarole  ) |
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