Yes, the 2018 best option for sure! - SB Tactical SBA3 Pistol Stabilizing Brace for Mil-Spec Extension Platforms

At this price point from OP, its a no brainer. Its a hot item, so I would temper your ship expectations as everyone in the industry wants one including many mass producing gun mfg. Form and function is on par with asking price. I would NOT pay more than $140 for it because there is a little bit of play in the lock position. I would recommend a V2 brace with a slightly larger bolt to fill in more of the buffer LOP hole. You would need to reuse your castle nut, tube seems milspec metal and thickness. Im a happy camper until what 2019 brings.