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10/25/2012 3:35:41 AM EDT
I've got a 16" S&W 5.45 upper. Any problems using this on a lower with an A1 stock, buffer spring and rifle buffer?
10/25/2012 4:48:48 AM EDT
[#1]
No issues in that configuration.
Provided that everything is in good working order, it is one of the most reliable lower configurations.
10/25/2012 11:46:17 AM EDT
[#2]
I would also get a heavier trigger spring.  I had inconsistent primer ignition until I got a stiffer spring, since then, it has been 100%.

Get some PHD ammo!
10/25/2012 1:06:19 PM EDT
[#3]
I would agree with the heavier springs. I recently grabbed up a S&W M&P 5.45  complete carbine the factory springs they installed are huge. Clearly they were thinking of the Harder Russian primers when they built the lower.
10/26/2012 5:09:35 AM EDT
[#4]
Oh I know all about the trigger spring and also about installing it backwards too. I had the upper on a different lower with an M4 stock but I was using an H3 buffer. I was just concerned about the rifle length buffer and spring on the carbine length gas system.
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