Engineering & Technical Division

How to install outer barrel to upper receiver using a Brownells Action Block
Brownells Action Block serves as a vise to protect your receiver from damage as compared to using a vise with this block.


Position the upper receiver in the block, take note of your guide. Place it where the forward pin is located, and then close it.


Then use the vise to position the block firmly.


Then you can insert the outer barrel into its right position.
Make sure you use the proper tools to attached and tighten everything to avoid scratching or damaging your receiver and barrel.


This Brownells Action Block is made in the USA and it is what we are using in our shop. So be confident that all your upgrade services in out shop are well made.