SS SVT-40 cup/piston set

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So i bought a replacement/upgrade kit for my SVT's gas system from Bill Berg down in America, looks good, fits okay, the piston fits the cup fine but my op rod had about .01 play and doesnt sit snug like the stock one does (serials were force matched to the rifle in refurb)

I figure under use there wont be a long time of dwell after the bolt hits end of travel, so i think the op rod spring should hold the cup firmly in place while in operation.
Corrections? Concerns? Help?

Much appreciated.
(Also Bill seems unwilling to reply to any of my 3 emails pretaining to this)
 
Don't know about those ones..But the ones Martin from Corwin Arms sold a while back..
Install and shoot..work fine..they weren't custom fitted to anything
 
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