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Hi Antonio, the slotted buffer tube will not work with this brace. Look at the 3rd picture down here, it is not slotted. >>> sb-tactical.com/product/sbm4/ And if you scroll towards bottom, it gives recommended buffer tubes for this brace. Stay safe & have a great day!

Hi Antonio and welcome. The SBA4 uses the slotted buffer tube. It is also Adjustable and the SBM4 is fixed. I would advice getting the adjustable SBA4 with the buffer tube attached already here : budsgunshop.com/product_info.php/products_id/143782/sb+tactical+sba4x-01-sb+sba4+brace+synthetic+black+5-position+adjustable+for+ar-platform+tube+not+included ----------- Cheers, stay safe and enjoy! righttobear.com/sb-tactical-sba4-adjustable-pistol-brace-ts-buffer-tube-kit-od-green/