had one and i am a HK whore but that POS wouldnt shoot at all. Sold it bought a Larue OBR which grouped 1/2 MOA. Now all my precision semis are JP Enterprises LRPs ... have mr223s, a bunch mp5s, all the P7s, mk 23, VP9s, USPs, HK13,33k, 53,93m HK51,g3K,91, 300/270 ... but will not buy an american made 556 or 762.