LMT AR15/M4 Collapsible Receiver Extension, Buffer Tube Kit
This stock kit allows the installation of a carbine receiver extension and collapsible stock on a AR15. Does not include a stock.
The LM556BTK is a receiver extension parts kit complete with a dry-film lubricated milspec receiver extension, recoil spring, end plate, castle nut and 3oz carbine buffer. This kit is ready for install and addition of your favorite milspec stock of choice.
*Remember proper torque spec and staking is strongly suggested when installing this kit.
Kit Contents:
(1x) AR15/M4 Receiver Extension
(1x) AR15/M4 Carbine Action Spring
(1x) 3oz Carbine Buffer
(1x) QD Receiver End Plate
(1x) Castle Nut
Dave (verified owner) –
Fast shipping and arrived in perfect condition with all components included. Installation was straightforward, and it has made the bolt pull feel incredibly smooth. The fit and finish are top-tier—typical LMT quality—and the dry film lube on the tube is excellent. A perfect fit for my MARS lower, and I highly recommend this for any AR-15 build.
Bryce K. (verified owner) –
One of the finest buffer tubes you can get. The included castle nut had a terrible fit, really loose, so I just found another one that fit better. No biggy. Threaded really tightly into the lmt lower I installed it on. Great stuff overall
M O. (verified owner) –
Very competitive price for all that’s included and they shipped it super fast. Want more proof that this sweatshop raises the roof? Need to make dinner in a haste? Chicken Ramen included! I rest my case.
Eric B. (verified owner) –
As always quick turn around time to ship orders and free dinner! Since all my money goes to my addiction. Completes the back end on of the rifle fit and finished first rate. A little closer to a complete rifle.
Daniel (verified owner) –
I am quite impressed with the tolerances of the tube. Yes, the lube does not go all the way to the threads, but I really do not care about the looks.
Also, the spring is noticeably quieter than all of my buffer tubes.