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Posted: 7/18/2006 12:00:55 PM EDT
| I have a Stag Arms left handed upper and I'm looking to buy a new barrel.The other day I came across a article about Stag Arms left handed rifle and the article explained that the barrel extension was made for left handers.So I went to stag arms site and they have listed three barrel extension STD, AMBI, and STAG-4 extension.My Question is, can I just put the new barrel on the upper or do need to buy a AMBI barrel extension from Stag Arms and replace it with one that's on the new barrel. |
A left-handed extension?  STD == rifle extension (shorter "rifle" feeding ramp cuts) STAG-4 == "M4" extension (M4 cuts) AMBI == ? I have no idea what an "AMBI extension" would be or why you'd need one. Left handed AR-15 == Left-Handed Ejection Port, Ejection Port Door, Brass Deflector, Forward Assist, and Ambi-Selector. Wouldn't you have to get left-handed mags and ammo too? J/K, of course...  ETA: I forgot the left-handed bolt and carrier in that list. The extractor has to be on the left, and the serrations on the carrier side for the forward assist to work have to be on the left too. |
AMBI is exactly that. A right handed bolt and left handed bolt will fit into the barrel extension. STAG's AMBI extension is the standard rifle extension made for both a right or left handed Bolt. |
| Wow, I had no idea that the extractor position (left or right) would be an issue for the extension. Mine looks bilaterally symmetrical, like an AMBI would be, but it's a DPMS rifle upper. What part of the extension is different on an AMBI? I have no experience w/lefty anything, so I'm curious. My father-in-law's left-handed, and I was thinking of building a carbine for him in the future. |
The Stag AMBI extensions have the edge chamfered on both sides of the locking lugs so that a bolt can engage the lugs clockwise OR counterclockwise. Regular extensions only have a chamfer grind on one side. This is hard to see without the extension off the barrel. People have run left hand bolts in regular barrels without a problem, but the RIGHT way to do it is to have the chamfer to help the bolt lug come around the corner during locking/unlocking. |
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