Received my 20G set today. Followed instructions (easy) took it to my club and shot 176: 75 = Win. AA 7/8 and 1oz 7.5 shot and 75 = Rem. Premier STS same load without a single extractor or insert problem. Insert is in tight. Then I shot 25 Rem. STS reloads, 1oz, 7.5 at 1250FPS. Again without a single problem. As a test my last and single shot was new Fed. Top Gun. Shell expanded so much I needed a rod to extract and the insert also came out. Sticking with Win. and Rem. even reloads. I used IM for all shots and I can not tell any difference from my 12G or my dedicated 20G. All broke just as hard. I ordered this set for my Browning GC XT Trap Combo. It's in the shop to convert the inertia to mechanical triggers, so I used the insert in my Browning BT99. Had a blast and fooled lots of shooters. I was surprised at the amount of residue blowback on the insert and receiver. It was dirty but I do clean my guns after every shoot whether I shoot 25 or 250. These inserts are of high quality and work even better then I expected. So much so that I'll be ordering the complete set. I do believe a Tube Set Driver is needed. The mallet provided is small and I am afraid that I might hit the internal extractor and damage it. I did not notice the weight of the insert which is a selling point for me. I would have purchased the full length insert if it weren't for their weight. Don't get me wrong, while I am more then happy with this product, it does get dirty. At least I don't have to worry about O-rings like other inserts. Highly recommend this product. Beats the price of a new gun that may not fit you.