This is a Tactical Solutions known as the X-Ring Takedown VR chambered in 22 LR, model XRATD-QS.
Tactical Solutions X-Ring Takedown .22LR receiver is known for its craftsmanship" lightweight design" and innovative features. Their takedown receiver is the perfect centerpiece for your takedown build" and upgrade for current 10/22 Takedown rifle. Compatible with the factory Ruger 10/22 Takedown Barrel and TacSol Takedown Barrel.
Features:
Quicksand (FDE) finish
Integrated 15 MOA Picatinny rail
Stainless steel bolt and charging handle
Dual guide rod system