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Guns, Bows, Shooting Sports, and Hunting M4-a1

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take some advise from smokin joe biden

I have an original Armalite M4A1, and would like to convert it to a gas-piston, W/all of the exceptionally educated and just plain naturally smart brainchildren that make up MOST of the TDR, I wonder if anyone knows if a modern upper assy (A2) will fit the A1 lower, the reason I was wondering is because My buffer tec pin shim fits a little tight in the A1... . ?????
 
I thought all the M4 designations were large pin, except Colt's? I don't have enough information... ...



As for the A1 and A2 uppers, both have the carry handle. The original M16 upper was a slick side. No brass deflector and no forward assist. The rear sight was adjustable for windage only.



The A1 upper originally had a forward assist and no brass deflector. The rear sight was adjustable for windage only.



The later A1 uppers, also known as the C7, had the brass deflector and a forward assist. The rear sight was adjustable for windage only.



The A2 has both, the brass deflector, and the forward assist. The rear sight is adjustable for windage and elevation.



As far as converting it to a gas piston, it depends on what kit you want. There are several manufacturers out there for direct impingement uppers and kits.



I've used the CMMG kits on several rifles with good results. I like direct impingement, personally, but I'm not sure how much of an upgrade it really is.



CMMG kits: http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_id=352



Osprey Defense: http://www.gaspiston.com/about-2/why-gas-piston/



Adams Arms: http://adamsarms.net/products.asp?category=100000



Oh, and for your shims, what do you mean? Do you have side shims that go on each side of the upper, around the forward attachment pin? Or are you talking about the tension pins? OR are you talking about forward attachment pin bushings??!?!? :confused:
 
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