[ARCHIVED THREAD] - 5.45 Heavy Hammer spring Question

Posted: 3/25/2010 8:51:10 AM EDT

I'm considering getting a S&W 5.45 upper. I understand that the heavy hammer spring is required for reliable function with this set-up.

My question is, does the heavy hammer spring have any effect on function with other uppers, i.e., 5.56 or 9mm, if I wanted to swap uppers around?

Thanks!

Posted: 3/25/2010 8:54:27 AM EDT

[#1]

I haven't noticed any negative effects with 5.56 uppers.

Posted: 3/25/2010 9:14:48 AM EDT

[#2]

That's good to hear. It was your blog post that got me looking seriously at that caliber. Thanks for the reply.

Posted: 3/25/2010 9:18:58 AM EDT

[#3]

Note, I haven't tried it with 9mm, and you will notice a heavier trigger pull. I should disclose that before you buy anything.

However, it's fairly simple to swap hammer springs if it bothers you.

Posted: 3/25/2010 7:36:59 PM EDT

[#4]

I've shot multiple uppers in various calibers (including 9mm) with the heavier spring and seen no problems. The trigger pull is a little heavier, but nothing to complain about.

[ARCHIVED THREAD] - 5.45 Heavy Hammer spring Question

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[ARCHIVED THREAD] - 5.45 Heavy Hammer spring Question

[ARCHIVED THREAD] - 5.45 Heavy Hammer spring Question