SR22 with threaded barrel: buffer tube?

I know this isnt about stocks. But I'm new here dont dont exactly know the whole site or how the forums work yet. I have an sr22 and cant find any picatini rails that match the threaded hole spacings along the forward grip anyone have any suggestions other the countersinking and drilling new whole in random picatini rails ?? Is there any websites out there the specialize in 10/22s and sr22s
 
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