Works as intended, not sure how long it will last. - JP Enterprises Hammer Stop Block

This is so much faster to put in a lower receiver for trigger testing than other products I've used and seen during rifle builds. However, it is loud. Very loud. When the hammer hits this block there is a pop like a fire cracker. If you're only doing a quick function check on the FCG while assembling a lower it's not a big deal. If you're wanting to use this for extended dry fire practice you need to use hearing protection since this pop will be happening so closely to your ears. The hammers started leaving marks on this block from the first use. So far it's been struck probably 50 times and is still intact. I'm not sure that it will hold up to repetitive strikes numbering in the hundreds or thousands. I wanted something to practice dry fire on a complete lower for developing tactile muscle memory and improving trigger control. I don't think that was the intention of this product but it is excellent for lower builds.