Machined from 7075 T6 Billet and then hard-coat anodized, these lowers are purpose-built to accept 45 ACP GlockA(R)-style magazines. The lower is proprietary assembled with a proprietary magazine catch and ejector, ready for all your standard AR-15 lower parts to build into a fully functioning lower.Non-Last-Round bolt hold-open.Item must be shipped to a valid FFL. Please enter your preferred FFL shipping info into the ship-to field at checkout.Please check your local laws before ordering. Not available for shipping to all areas.