When a standard AR-15 is converted to .22lr through a conversion bolt or replacement upper, the bolt catch stops working. The Catch22 V2 slides over a stock AR-15 bolt catch to work with most common .22lr conversions and give you bolt catch functionality again. To install, just slide the Catch22 over the stock bolt catch and you're ready to go. This allows you to easily swap between calibers without the need for any tools. The bolt catch is compatible with CMMG, RTB, Spike's Tactical, Tactical Solutions dedicated upper receivers and conversion bolts, as well as similar Ceiner kit conversion bolts. For the bolt catch to provide true last-round-hold-open, the mag Mfg: Ar Catch22
