Completely fixed my shadow systems cr920xp (glock 43x/48 equivalent) - DPM Glock Mechanical Recoil Reduction System

My brand new Shadow Systems jammed every single round for the first 275 rounds. Before shooting, I fully cleaned and lubed it up, then used the standard 124 grain 9mm recommended. I saw a YouTube video using the DMP recoil system, which appeared to eliminate jams… so I bought it immediately. Using the medium spring, I ran 150 rounds of 115 grain to see if the DPM was able to handle standard rounds like on YouTube, and I had zero failures to feed or cycle. In addition, the slide stayed back after the last round each time… which did not happen with Shadow Systems’ stock recoil system. Next time I will try the heavy spring to reduce recoil more (with the same 115 grain ammo) to see if it cycles as reliably. Outstanding product!