New Frontier Armory posted this up on their Facebook. Apparently the polymer lower came through the mutilation of being run over by a bush hog just fine.
CHECK OUT THIS PIC AND LETTER WE JUST GOT FROM A CUSTOMER TODAY ON THE DURABILITY OF OUR LW-15 LOWER. PICTURES ARE WORTH A MILLION WORDS!!
This is the result of running over one of my AR-15s with my 50hp tractor and a 6 ft Bush Hog. How it occurred is a long sad story, but of no importance to you.
The lower is one of you polymer lowers. What happened here speaks volumes about the ability of the polymer lower to take punishment and keep on functioning.
The polymer stock was ripped out of the threads of the lower. The keeper key was bent and the buffer with spring went flying. The bolt carrier was sticking about 1/3 of its length out of the back of the upper. You will note that the rear takedown pin appears to be missing, not so. The upper sheared the rear pin off at both ends and the polymer pin’s center was still in the upper. The half full magazine was ripped out of the lower. After cleaning, the magazine went right back into the lower and locked up, with the release functioning as prior to modification. The trigger, sear and hammer functioned perfectly after the sand was removed and the lower was flushed.
After cleaning with mineral spirits and flushing then hammering the key flat, the stock treaded right back onto the lower, locked up, and was ready to go with the replacement of the rear pin, plunger and spring, plus the buffer plunger and its spring.
The aluminum upper receiver did not fare so well, it was cracked where the barrel extension attached to the upper receiver. Oh, I had to cut the barrel, forearm and gas tube off 6 inches in front of the receiver with a saws-all to get the upper apart. The barrel was bent in 3 directions and the gas tube, still attached to the gas block, was wrapped around the barrel.
If someone wants to know how tough your lower is and if your lower will take punishment, show them this picture.