This is the external face of the KNS Precision adapter. It will fit into the groove in the KNS Precision adapter and make for a very solid connection. Note, if you install a folder, buy one with the boss – the raised oval shape. Since the SBA4 is ATF approved, I opted for a modular adapter block from KNS Precision going to an Ace Limited (owned by Doublestar and not IWI) folding M4 adapter – the FSM-AR. The roll pin is just stopping vertical travel and is more than enough. Notice how the “plate” or “block” sits in a groove and that’s what provide the bulk of the strength. With the pin removed, it literally lifts out. That’s all you need to do and then the rear plate of the receiver that holds the hinge, or anything else for that matter, will lift right out. The Ace is resting on a green bench block and I used a roll pin punch to tap out that single pin. The block can the be lifted straight out and whatever you want installed in its place. The Ace design allows for very easy changing of a rear block by simply driving out one roll pin. Both PSA and Brownells have the brace available. I may very well do this in the future but I didn’t want to deal with it right now. Now some may wonder why I didn’t just file for a short barreled rifle (SBR) tax stamp and run a normal stock. The FSM-AR adapter is between the tube and the receiver.
The bottom e dges do not flop around like they do on the SOB and SBA3 braces.
The SBA4 brace is beefier and more rigid that previous braces. If I could have found the pistol model without a brace cheaper, I would have done that. Palmetto had a great deal on this model and that’s why I bought it. The SOB4 brace is what comes with GAP51SB pistols. Seriously, the SBA4 is the most rugged brace I have found yet. While the SOB is rugged, it is not adjustable so I installed and SB Tactical SBA4 brace. My Ace came with a SB Tactical SOB brace mounted on a proprietary IWI tube with a very heavy hinge. In my previous posts, I covered a bit of the history of the Galil Ace, did two posts about the differences between the Ace and an AKM that I observed (click here for the first and here for the second) and now that leads up to me making a few tweaks of my own to my 7.62×51 Ace pistol.
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