gunrunnerhell: SR9 A modified custom HK SR9. The SR9 in its original form has a thumbhole stock, a distinct rounded handguard and lacked a flash hider. It did however use a heavy, polygonal barrel unlike the HK91. This example has had a picatinny rail
tags: Professional Re-blogger,
from: https://ovidoman.tumblr.com/post/94113176916