Currently, the 357 Sig is our most popular build. The main question that we get is: “Can you rechamber my 9mm blow back to 357 Sig?” or “What is the price and delivery for a 357 Sig barrel for my 9mm AR?”
Our Sig builds are gas operated and take a customized 6.8 SPC BCG and custom Gas system. These are NOT blow back barrels that can be swapped on to your 9mm lower. This makes the build much more expensive than just a barrel swap. Lead times are now down to 1-2 months!!!!
There is a reason you can’t find 357 Sig Blow Back barrels any more: They Blow Up! They cause case head separations and can damage you and your upper.
We can tell you how to modify your glock mag lower to use with our gas operated 357 Sig Upper. Or get one of our new mags that fit standard lowers!!!!!!!
Our new beta dedicated 357 Sig-AR Mag is now in testing! Operation is much smoother than when using glok mags and we don’t have the width issue when using TCM mags and an adapter. We are working on improving the geometry and round count so we can get these out to our customers.
Because gas operated pistol caliber uppers have such short gas systems, be prepared to clean your upper on a shorter cycle than a carbine or rifle length system.
