Feb 19, 2005 · You see this with the XM16/M16 and XM16E1/M16A1, as well as, with the XM177 and XM177E1. Interestingly enough in both cases the Air Force guns, come second in the Colt numbering system. 603 being the XM16E1/M16A1 and the 604 being the XM16/M16, while the 609 is the XM177E1 and the 610 is the XM177.

Apr 16, 2023 · My understanding is 604 manufacture started in parallel to the Army 603 circa late 1963/early 1964. Prior to this there was only the Model 01 and Model 02 marked guns. I've read that the Air Force ret

Sep 16, 2002 · In doing some research recently I've become a little confused (imagine that). I'm trying to figure out the differences between the XM16E1 and the M16A1. I know they both had the forward assist. Did the XM16E1 have the "fencing" around the mag release on the lower receiver, or was it a slabside? The M16A1 - did it always have the birdcage flashider, or did it have the three-prong flashider ...

Dec 21, 2017 · For a while the XM16E1 (603) and the XM16 (604) were identical other than the forward assist and markings. The early ones both had the improved 3-prong (2nd version flash suppressor), chrome BCG, D stock, Edgewater buffer, partial fence (just for front captive pin), and dimpled FCG pins.

Jul 21, 2020 · All, I decided to revamp @Ekie's USGI M16 Series Variation Guide because I have gotten tired of seeing all of the Photobucket watermarks over all of the pictures... Hopefully Imgur doesn't decide to s

Nov 11, 2018 · Being that mine was a later serial number I was told i can get away with A1 parts on the lower but what is essential as far as the lower parts go to be correct?

Jan 18, 2020 · I working on my late XM16 build and a picked up a gray buffer tube. I am trying to go with all original Colt parts and make it as close to original as possible.

Oct 25, 2008 · New info, so here is an update. Some years are rounded off, for example the chrome chamber went into production in September of 1967, I round it off to 1968, same story with the chrome bore, introduc

Apr 16, 2020 · So I popped my 80% cherry this afternoon and milled my first one and it was my XM16E1 Braceman reweld. I couldn’t be happier with it. I also ordered the parts I need to finish the lower and they sho

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