This MBA-3 carbine length stock was purchased for use on an airgun with an AR-15 carbine length buffer tube and stock. It replaced a stock that did not give me repeatable check weld and was a little on the short side at a LOP of 14 inches. Once I changed to the MBA-3 stock, the LOP went to 14 3/8 inches and was subsequently lengthened to an optimal 14 5/8 inches. More importantly, as soon as this stock was in place the alignment of my eye with the scope was perfect and repeatable. I did not have to adjust the comb/cheek riser to get exactly what I wanted. Durability remains to be assessed, but I'm very happy with this as a replacement for what wasn't working for me.