As the great poet said, "Cry 'Havoc!' and let slip the dogs of war." Except you can't let anything slip UNTIL you install the Cry Havoc QRB Takedown Barrel Adapter on your AR-15 or AR-308. Then, whenever you need to, you can slip the entire barrel / handguard / gas tube assembly off your rifle and slip it right back on. Cry Havoc's easy-to-use system lets you to remove and install the barrel assembly in 6 SECONDS or less without a loss of accuracy. It makes your AR-15 exceptionally compact and easy to transport. You can also convert it into a "switch barrel" rifle that lets you swap barrel assemblies for different kinds of shooting. The QRB Takedown Adapter is easy to install. Brownells Gun Tech™ Caleb Savant walks us through the process step-by-step. Items that'll make the job easier: a Magpul Armorer's Wrench, some grease, and blue Loctite®.
The QRB adapter has two main assemblies, the receiver plate and the barrel plate. Start by installing the receiver plate and gas tube extension on the receiver. The receiver plate is locked in place by a setscrew secured with a dab of blue Loctite®. Next, install the barrel plate on the barrel. Quick-release clamps on the barrel plate lock the barrel to the receiver, and Cry Havoc made it easy to adjust the clamping tension. Secure the three setscrews that anchor the barrel in the barrel plate with a bit of blue Loctite® on each. Insert the bolt / carrier group to check for proper function. If the bolt locks up properly into the barrel extension, you're good to go with installing the gas block, gas tube, and handguard on the barrel assembly. The handguard attaches to the front of the barrel plate just like it would to the receiver.

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