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DramaticGnome posted a topic in Vepr-12I have a IZ433 (so basically an Izmash made Vepr-12) and it was having issues running cheap birdshot. The main problem was I had my red dot placed right in the way of the ejecting shells, causing misfeeds. I moved the red dot to the rear of the receiver and that definitely improved my reliability, however I was still experiencing jams or misfeeds every couple of magazines. I polished up the rails, hammer, and the part of the bolt carrier that contacts the rails hoping to get the degree of reliability I wanted using light loads. Now I experience a jam maybe 3-4 times out of about 100 shells. I want to improve the reliability even more, however I have heard horror stories about saiga 12's and veprs that fall apart and start to peen if heavy loads such as buckshot and slugs are fired through them after they have been modified to run light loads. My understanding of the gas system used by the Vepr 12 and IZ433 is that its basically a saiga 12 with the gas all the way open. Is it a good idea to put in a lighter recoil spring (i've seen aftermarket springs available and have read that you can use 1911 recoil springs as well) if I run buckshot, buck & ball, and slugs regularly, or should I have 2 recoil spring setups one for light loads and the other for heavier stuff? Or maybe run one of the progressive 1911 recoil springs to hopefully reduce the wear on the gun with heavier loads?