https://greyhive.com/videos/watch/db3be4c3-a56c-4358-89ad-96ae722cd990 Can you use a standard AR upper receiver to build a 9mm upper? What to do if a Colt mag doesn't drop free - upper receiver test and fix. I wear ear plugs, or muffs, or both, in every shooting video. Disclaimer: Blowback9's videos are filmed at a private shooting club in a controlled setting under the supervision of trained professionals. Blowback9's videos are for entertainment purposes only. Do not try to recreate or mimic anything seen in Blowback9's videos. Do not act in any way based upon any of the information found in Blowback9's videos. The accuracy of the information in Blowback9's videos is not guaranteed or warranted in any way. You, and only you, are responsible for the consequences of your actions. By watching Blowback9's videos you agree that we will not be held liable for any injury to yourself, others, or property resulting from attempting anything based on what is shown or described in these videos. Tue, 10 Nov 2026 19:47:46 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://greyhive.com https://greyhive.com/lazy-static/avatars/5746210d-885d-44b2-9be0-92bf1e4d34df.webp https://greyhive.com/videos/watch/db3be4c3-a56c-4358-89ad-96ae722cd990 All rights reserved, unless otherwise specified in the terms specified at https://greyhive.com/about and potential licenses granted by each content's rightholder.