M4 feed ramps or not? (w/ pics)
Hi guys,
I decided to replace the A2 upper on my factory MT6601 (20'' 1/7 Colt barrel mfg 04/00) with a flat top one so I started looking for a receiver w/o M4 ramps... while I was cleaning both my Colt today I noticed that the barrel extension's cuts on my 6601 look very similar to the M4 extension on my 6731 upper..
the barrel extension on the 6601 is not marked with a "4" like the 6731 but that look like a M4 barrel extension on a rifle receiver to me....
6601
http://img408.imageshack.us/img408/4...ag0002v.th.jpg http://img405.imageshack.us/img405/1...ag0004i.th.jpg http://img34.imageshack.us/img34/2871/imag0005er.th.jpg
6731
http://img337.imageshack.us/img337/7...g0006nl.th.jpg http://img263.imageshack.us/img263/6...g0007li.th.jpg http://img593.imageshack.us/img593/8...ag0008p.th.jpg http://img827.imageshack.us/img827/3...g0009ht.th.jpg
what do you think? do I need new glasses? :D
M4 receivers are easier to find so if that's really a M4 extension it would make my research a lot simpler.
thanks in advance
Frens