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.
Well.. this would be less smooth with a proof research barrel.. their barrel is a tight fit.
Looks like that barrel nut has been removed a few times 😜
What AR vice are you using. I definitely need to order this
Is this California legal?
What is the upper receiver vice tool you are using?
Would be pretty sweet to be able to use this sort of setup on an AR-10 to swap between .308 and 6.5
So the barrel is literally held in by 3 set screws… hmmm…
I like the Dolos better.
This plus law folder one could almost put an entire AR in a fanny pack…. so that's why dad's still rock them
Had no idea that was even a thing until I saw a video from you about it.
thanks for publishing it.
I may not have a use for it but at least I know what it is and how awesome it would be if I ever did need one.
Love it but looks illegal for California…
If the handguards used has anti rotation tabs would it still work with this adapter?
My only issues with it are the proprietary gas tube and the fact that the most expensive part is on each barrel instead of the receiver. LEO takedown is the opposite and doesn't have the special tube. However.. It's a more complicated part and is a bit heavier.
For when you want to feel like Agent 47. 🙂
Best advice I ever received was from multiple gunsmiths and competition shooters: Never LockTight a firearm.
Anybody know how heavy this is?
Already bought one before you posted this video. It's gonna be nice, can't wait to post new videos with it.
Excellent job of showing and explaining this. Clear and concise, and perfectly filmed. I like your Loctite procedure, too. Saves time and mess.
Outstanding information Brother 👍👍👍
Show the handguard part for max fun
Great video !
As others have said, I can't see this being of much use to the average shooter. May come in handy if you are trying to sneak a freedom seed ejector into the capital to dispense freedom to the commies occupying it tho.
Very good video
Very cool. I wonder if it would be possible for them to update the system to have continuous pic rail on the 12 o'clock to mate up with the upper and handguard. That really seems to be the only downside on paper that I can see.
I would appreciate a listing (or links) of the products used in this video. I really liked the Upper Receiver Fixture.
I like it! Thank You. Caleb's hair looks extra spiffy today.
Any limitations to which handguards you can use?