Anyone have a Remington SPS Tactical .223 bolt gun with 20" barrel? I recently purchased one for my son. It had around 300-500 loads through it I am told. It has an HS stock off a 5R and a Timney trigger set at about 2 lbs. I am using a Mark-AR 6-18x40 with decent rings set on a Nightforce rail. The best we have been able to manage at 100 yards in a 5 shot group is maybe 1.5"-1.75". I am thinking the gun is jacked. I have used factory loads as well as hand loads. 55g-69g. I shoot quite a bit and 1/4" is manageable with my Suarez tactical .308 so I am thinking it is not me. I have also had a friend who shoots a lot fire it with the same result. Any advice, anybody?