So I threaded the barrels on my Saiga 7.62x39 and 2 SKS's I tried to put my Spikes Tactical Dynacomp on and it wouldnt thread down so i tried the M2 birdcage style off my mini draco and it fit as did my SLR Rifleworks SR47 and the standard slant style brake. The ST Dynacomp did not fit any of the 3 barrels i threaded yet it fit the mini draco, and all the other brakes fit all four barrel threads. ANY IDEAS?