AR Sponsor
Posted: 7/15/2007 12:37:34 PM EDT
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Ok I went to the range yesterday to have some fun with the bushy AR. The scope I have mounted is a BEC 3X9X42 with illuminated reticle and bullet drop compensator. The problem is I was shooting at 50 yds and my groups were continually about 1 1/2" to 2" high, so I adjusted the scope acordingly. The scope has 1/4" at 100yd click adjustments so I figured about 8 clicks should be pretty close. so I shot another group and it did drop it but after about 5rds the group moved back to where it pretty much was. I tightend the allen screws on the rings but to no avail. I'm pretty new to this so I'm not sure what to do. I'm so fustrated I'm about ready to get rid of the carry handle mount and get some high rings and mount it on the reciever. Here's a pic of the setup:   If anyone can give me some help or sugestions please do, as I know this gun can do better. |
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You have three points of looseness... (1) rings to carry handle mount, (2) carry handle mount to carry handle, and (3) carry handle to receiver. Any or all of those can be a problem. That is IF it is not the scope. Your scope needs to be mounted directly to the upper receiver's rail. Also, most scopes will not mount forward enough, for good eye relief, on the A3's rail. I have found that for most scopes, the Armalite mount works well. For your scope, I don't know if it will mount due to how short it is. The Armalite mount is a one piece affair, the bottom half of the rings are all one piece with the base. They come in 1" and 30mm versions, and cost about $90.00.  This mount puts the centerline of the scope at the same height as iron sights, and also has some forward offset to give good eye relief for that "nose to the charging handle" cheek weld. Here are some measurements. The rings are 3/4" wide.  OK, let's get back to scopes... $30.... hmmm. You can get a Simmons that isn't bad, 3-9x40 for about $40 that is probably a better scope. But in general, the more you spend on a scope, the happier you are going to be. With cheap scopes I have had busted crosshairs, loose reticles after only a few shots, and other problems. On my scoped AR-15 (not the one in the photo above, I sold that upper) I have an IOR Bucheresti M2. This is unquestionably the ugliest scope on the market. It looks like something that fell off a steam locomotive. It also has some of the clearest optics I have seen, including scopes costing 3x as much. I paid about $375 for it and it was money very well spent. The IOR M2 is 4x, 30mm dia. It also has target type turrets, bullet drop compensation for 62 gr 5.56 (which is close enough for 55 and 69 gr out to quite a distance), and a lit reticle for low light shooting. It has very repeatable adjustment and return to zero. |
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actually, the scope was closer to 60 bucks. I tightned the allen screws on the rings, at the range, but didn't have a pair of pliers or anything to try to tighten anything else. Just went to the safe and checked all the areas you mensioned for tightness, and found the rear screw on the carry handle to receiver was a little loose, loose enough I could turn it half a turn before it snugged up. So I took a pair of pliers and snugged all of the screws. Another question. If I was high by 1 1/2"-2" and the adjustment on the scope is i click 1/4" at 100yds and I was shooting at 50yds, How many clicks would I need to come down 
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Lets see, train A leaves the station at 11:00, then train B leaves the station 40 minutes later but is going 50 miles per hour more with both going at total distances of ........  If the scope is moving 1/4" per click at 100, then the clicks will be 1/8" at 50 yards, i.e 8 clicks per inch at 50 yards, 4 clicks per inch at 100 yards, 2 clicks per inch at 200 yards and so on.  |
I would not go so far as to use pliers to tighten the knobs, but a good size screwdriver is good. Before mounting, clean off all oil and grease, and put some BLUE Locktite on the threads. Blue Locktite is "service removable", meaning it will break loose with hand tools and not require torches or grinders. Lacking Blue Locktite, a little "Ladies' Locktite" will do. (fingernail polish) 
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