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Posted: 6/18/2014 5:23:43 PM EDT
[Last Edit: 6/18/2014 5:36:33 PM EDT by SWMP15AOP]
I have an M&P 15R that I am putting a 300 Blackout upper on. I'm wondering if I should change out the orange hammer spring while I use the lower with my 300 upper? Any concern about striking 300 blackout primers with a setup designed for the hard Russian primers? Is it an issue or not?

ETA - This is not about S&W specific guns, it's simply about using a stronger hammer spring where it's not needed. Will striking primers too hard (maybe piercing them) create a problem? I just don't know the answer and thought I'd ask the question.
Link Posted: 6/19/2014 1:41:58 PM EDT
Dang, nothing?
Link Posted: 6/19/2014 4:09:09 PM EDT
You should have no problems. As far as I know the hammer spring can't increases the chances of piercing a primer. Firing pin depth and over pressure are the two most frequent causes I am aware of.

Lighter springs will frequently cause a light strike which on military/hard primers can be a issue.
Link Posted: 6/20/2014 4:07:16 AM EDT
Will be good to go. No change needed.
Link Posted: 6/20/2014 4:12:56 PM EDT
Muchos Garcias.

I'm putting the 15R upper and the 5.45 ammo away in favor of .300 Blackout / Whisper assuming the market for that ammo returns to normal or get's normal!
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