short (receiver length) fiber optics for AR?

[Bic]

Yeah, I actually have an A2 take-off with all the fixins, but it came off aColt (I'm told) and the buffer tube will only thread into the action about 1/4". It has been mentioned by a local gunsmith that the receiver has been 'painted' - I guess as opposed to phosphated? and that maybe the problem. A mil-spec stock wouldn't even start to fit into commercial receiver...........would it? Or were Colt's so different to both?

[twyacht]

The diff. between the mil-spec and/or commercial is small yet pronounced. I would send m25operator, or bafsu a detailed inquiry. The threads are the same, however the diameter is just that much of a difference.

Similar to Colt's large hole diameter. Colt, did gum up the works with receivers and different sizing. .125 vs/.165 sizing. yet somehow, barrel dimensions remained the same.

There is an easily resolvable solution, I just defer to the guru's for the resolution of those nuances. M25 can give you a solution easily.
Send him a PM.

[Bic]

Well, that nasty A2 grip came in useful for something  -  holding the lower in my vice while spending all morning threading the tube into it!
I tried many different lubricants as 'cutting fluid' and WD40 seemed to work best, but it was still quite a workout, the guys from whom I bought the action suggested a strap wrench but I found a wrench on the buffer tube 'nut' worked better. I'd have to suggest staying away from 'anodised' stripped lower receivers in the future.

MP

[MikeBjerum]

Lots of good advice and porn, but I haven't seen any stamped with the "toe of approval"