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, 6.5 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.