Got this one a while back but unfortunately it didn't fit the TM spec buffer tube (which is around 1.14" in diameter) due to the fact that the notch holes are casted a bit too deep - the brace could literally slide in and out. Forgot about it for a goof but until I found a G&P Stubby stock assembly. Turned out the brace fit perfectly on this one with absolutely ZERO major modification, as it is nearly 100% mil spec. It can also be used like an actual brace, however you may want to round out the inner edges. Feels good on the shoulder due to having a good amount of bendable rubber, but length of pull leaves something to be desired. Props to Depot for having this meme piece of plastic since as far as I know you can't find another airsoft version of the SBA3 domestically, at lease a standalone version.