I bought a DSA type 58 rifle some years ago. It's been a redheaded step child from the get-go. I bought a DSA folder kit for it, and the top cover/scope mount. The current problem is the bolt will not lock open on an empty mag, or manual with the bolt hold open device. My conclusion is it is because the springs are too long to compress and allow the bolt carrier group to retract rearward enough to engage the locking mechanism. My discussions with the factory on this did not help me much. I got a another set of para recoil springs and I've been trimming them down si I have the clearance for sufficient rearward bolt travel, trimming both inner and out springs evenly from the forward end. I have it now where it will lock up with out too much excessive force. One more snip should do it. My concern now, after I've cut about 1 3/8" off the springs is if they are going to be powerful enough to slam a round forward correctly to chamber correctly. I figured I could compensate for the recoil force by reducing gas pressure to the piston. Has anyone else ever had to deal with this before? How did you do it? Thanks in advance.