FAB Defense M4 Folding Collapsible Buttstock for Zastava M70 B1 B3 / M77 B1 Black. These Rifle Stocks from FAB Defense feature rugged 6061 hard anodized aluminum buffer tubes for long lasting performance. Add recoil control and comfort to your rifle with the FAB Defense M4 Collapsible Folding Buttstock for Zastava Versions M70 B1 B3/M77 B1. Specifications for FAB Defense M4 Folding Collapsible Buttstock for Zastava M70 B1 B3 / M77 B1: Manufacturer: FAB Defense Color: Black Gun Type: Rifle Condition: New Features of FAB Defense Folding Collapsible M4 Style Buttstock for Zastava M70 B1 B3 / M77 B1: Non slip Buttpad design for superior shoulder positioning and tactical performance After market sized 6061 hard anodized aluminum buffer tube Water proof anti rattle storage compartment for two CR123 or AA batteries Integrated quick detach sling swivel connectors on both sides Locking is released by the push of a button Spring lock on folded position opens by a simple pulling motion and locks Left folding stock by default Package Contents: FAB Defense M4 Folding Collapsible Buttstock Upgrade for Zastava M70 B1 B3 / M77 B1 What firearm models does the manufacturer say FAB Defense M4 Folding Collapsible Buttstock for Zastava M70 B1 B3 / M77 B1 is compatible with? The manufacturer says that FAB Defense M4 Folding Collapsible Buttstock for Zastava M70 B1 B3 / M77 B1 is compatible with Zastava M70 B3 Zastava M70 B1 Zastava M77 B1 Zastava M70 Zastava M77FAB Defense M4-ZAS P-B: M4 Folding Collapsible Buttstock for Zastava M70 B1 B3 / M77 B1 Black