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Mark 4 problem?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/10/2007 at 21:31
snpr9696 View Drop Down
Optics GrassHopper
Optics GrassHopper

Joined: June/10/2007
Location: United States
Status: Offline
Points: 3
Hello all, Ive posted on a couple other threads as well so sorry if this is repeatative. I completed my build an 18' WOA barreld SPR Bushmaster w/ LaRue 13.2 Freefloat Handrail and Vltor flash hider. I mounted a Leupold Mark 4 MR/T M3 3x9 scope using the LaRue SPR 1.5 mount on the receiver. After a quick boresighting i went to the range and shot a nice 1inch group at 100yrds. Problem though is it was approx 8-10 inches high. I attempted to dial down for the correction but my Mark 4 has no more available move ment for the correction.

What do I do?

Shiming is not an option due to my using a throw lever mount. Everything is properly tourqued to spec 40lbs on the barrel and 15in lbs on the rings. The rings have ample room and do not touch the obj bell. The flash hider is tightened a little more then hand tight w/ loc-tite. And if it help even the Iron sights are way off, like 3 ft High. Im confused.

Do all Mark 4's that use a BDC method have the reticle/erector tube start at the bottom with no room for inital set up. I though most scope give you ample MOA adjustments up or down and start somewhere in the middle.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/12/2007 at 15:58
Urimaginaryfrnd View Drop Down
Resident Redneck

Joined: June/20/2005
Location: Iowa
Status: Offline
Points: 13826
Sounds like you need professional help - might try GAPrecision in Kansas City. I'm thinking if if the iron sights are 3ft high and the scope is maxed out of adjustment and still 8 to 10 in high, it is the way the barrel is fitted to the upper reciever. I have two Rock River Arms guns and a Colt that are dead on at 100 yds and shoot a very tight group - so the other choice might be to trade into a Rock River upper complete or trade the whole gun for an RRA gun and put the Mark 4 on that probably with a vortex flash suppressor. Who built the upper you have now maby you should take it back to them and ask them why.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/12/2007 at 16:42
Rancid Coolaid View Drop Down
Optics Jedi Master
Optics Jedi Master

Joined: January/19/2005
Location: United States
Status: Offline
Points: 7640

You don't have a Mk4 problem, you have a Bushmaster problem.   Is your mount bent?  Are you shooting with both eyes closed?


That the scope and irons go very high is unusual - since the scope is mounted to received and independant of barrel and the sites are mounted on received and barrel.


My recommendation, like U. said above: swap the Bushmaster for a Rock River.  Or find the guy that did the work and make him fix it.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/12/2007 at 18:44
sandsock View Drop Down
Optics Apprentice
Optics Apprentice

Joined: January/16/2005
Location: United States
Status: Offline
Points: 172
Barrel alignment or bent barrel....even with all the adjustment possible you've got a flat shooting round and a scope a few inches off the bore line.....if everything was mechanically zeroed it wouldn't be terribly far off the POI.
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