Originally Posted by
markm
The extra 1.5 is ALL THE DIFFERENCE in the world.
not even comparible to the 14.5. You need to have every part just right to run a rifle buffer reliablely.
I just got through changing the gas tube on my 14.5 middy. The part the tube that the gas key slides over was .010" too narrow and it was giving my carbine lock back fits. I could see a lot of carbon fouling on the tube forward of the upper receiver.
No misfeeds, but almost constant failures to lock back. My 14.5 BCM middy will run a rifle buffer system as long as I'm not losing gas ANYWHERE in the system. It's borderline... and H buffer is optimal.