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Posted: 3/8/2010 6:26:54 AM EDT
I have a 9mm upper which I will be using on an ar 15 lower with a 9mm magwell conversion block (colt style). I'm using a 9mm bolt which was ramped by ADCO. My buttstock is a Rock River Arms tactical car stock (non-collapsible) fixed length. This comes with the same spring and buffer used in an A1/A2 buttstock. According to RRA's conversion info I need to use a stock spacer, 9mm buffer and car action spring see below:

http://www.rockriverarms.com/popup.cfm?type=t&id=4

I want to know what would happen or not happen if I just use the spring and buffer the buttstock came with?

Thanks,

Frank
Link Posted: 3/8/2010 7:04:58 AM EDT
My guess, incorrect mass for the blowback operation of 9mm. You end up damaging or causing increased wear on the rifle if the mass is to low.
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