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Page AR-15 » Build It Yourself
AR Sponsor: bravocompany
Posted: 1/15/2021 3:34:08 PM EDT
Does anyone know what the actual dia. of a M16A1 gas tube pin should be? The reason I am asking this is because I'm using an A2 FSB on a barrel I received from Del-Ton. I called and they told me the pin dimensions should be 5/64×5/16. I have some 5/64 roll pins and man they sure seem to be just big enough to NOT fit
Link Posted: 1/15/2021 3:42:55 PM EDT
[#1]
The Colt gas tube pins I have used have always been tapered.
Link Posted: 1/15/2021 3:55:37 PM EDT
[#2]
.081 x .312
Link Posted: 1/15/2021 3:59:19 PM EDT
[#3]
Hole in FSB and gas tube are both spec'd at .078" DIA + .003".
Link Posted: 1/15/2021 4:02:48 PM EDT
[#4]
I'm new to this building retro stuff and didn't realize that this pin comes in a tapered style. Using those dimensions of .081/.312, the ones I have should work. But man they sure seem big to these old man eyes. Thanks gentlemen!
Link Posted: 1/16/2021 12:24:14 AM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The Colt gas tube pins I have used have always been tapered.
View Quote

From the first Colt "Model 01", the pin used to secure the gas tube to the front sight has been an MS16562-106 tubular, slotted, spring pin (nominal 5/64 x 5/16).
Link Posted: 1/16/2021 11:07:16 PM EDT
[#6]
Thanks for all your help guys. The pin worked perfectly. This thing is so ugly it's actually sexy. Wish I knew how to post pictures here. Again thanks for your help.
Page AR-15 » Build It Yourself
AR Sponsor: bravocompany
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