CMMG AR-15 .22 LR BOLT HOLD OPEN ACTUATOR AR15

Drop-in parts for rifles fitted with a CMMG or Atchisson-style .22 LR conversion kit work with the existing bolt catch to lock the bolt to the rear after the last round is fired. Molded polymer Bolt Hold Open Actuator fits into the top of the magazine well to precisely align a CMMG 25-round .22 LR magazine for reliable bolt lock open. Alignment can be further fine-tuned by adjusting the actuator’s steel bolt-stop plate with the included hex wrench. Requires the spring and follower set sold separately. No permanent rifle modifications required; simply lift out the actuator to return to shooting centerfire ammo.