how does bolt/carrier weight affect rate of fire

secondofangle

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I figure the Uzi guys will know as much about this as anybody, but my question relates to HK. I got an aftermarket RCM bolt for an SP5K I'm going to use as a sear host. The website says it's "tungsten filled" and CNC machined and all that so I figured it would be virtually identical to an HK bolt but it's notably lighter at 5.4 oz versus 5.8 oz for the HK, and that's with the latter missing the trip ramp material so the difference is probably a little more if the HK bolt were a FA carrier. Doesn't sound like much but we're talking 7-8% less weight and I know this can affect rate of fire and function, etc.

Anybody have general comments or specific knowledge/experience about this?
 

A&S Conversions

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You are aware that you could have the original bolt carrier welded up and reprofile the trip surface. Of course a very slight change of angle of the locking peice would make a bigger difference in ROF.

Scott
 

secondofangle

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Yeah, I'm going to send the SA carrier to Brad at Banhoff; meanwhile I'm just trying to understand all these nuances of HK
 

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