Our New Vented Stone Krusher Flat Spiked extension W/Detent Notch for the Yugo M92/85/Zastava threaded in M26x1.5 LH offers a new design and length. For door breach, defense and barrel counterbalance. This machined aluminum vented extension is finished in flat black anodize, 7 inches in length and weighs about 10 ounces. May Be used to reach compliant barrel length if pinned and welded. Be certain to check your barrel length.