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I have a pump bb/pellet rifle (760 Pumpmaster) with the standard iron sights and want to put the Tasco 4x15mm scope I bought (cheapo but hopefully faster/easier than the iron sights which are a little bent anyway)
1. It looks like I just....pry/pop off the iron sights? Is that right because its not coming off but there aren't any screws
Mounting instructions - not sure I get these at all -
1. Something to do with focusing the reticle...... the stupid question first - the fat "eyepiece" end with the adjustment goes on the end closest to the eye right, otherwise everything looks farther away? Not sure about the rest
2. Slide mount into dovetail groove on receiver - don't think I have dovetail grooves....to me it looks like it would just fit over the whole barrel?
As close to the stock as possible?
Mounting grooves look like two parallel grooves along the top of the barrel. Typically, the more powerful pellet guns and 22s have the grooves. A BB gun may not be designed with these, so you might have to hand make a mounting bracket.
Ah ha! Those things - they aren't groves, they are raised things
So ok, the "grooves" start just above the back of the curved part, then stop where the opening for the pellet cartgridge fits then starts again.
How do I know how far forward or back to put the scope on the grooves? Straddle the opening? All the way forward of the opening? It just barely fits all the way back closest to the eye.
Generally you don't want the scope real close to the eye. Get used to having a few inches space, so that if you graduate to something a little more powerful you won't have to re-learn.
Your next job is "sighting in" the scope. Use something like a tissue box or small cardboard box to make a V box. You cut two 4" deep V shaped cutouts in opposite sides of a box. Rest the cocked an loaded gun in it, aimed at a target. Sight in the scope where the BB should hit, then pull the trigger without moving the gun or box. Note where the actual hit occurred and adjust the scope according to the directions with it. Once you have a match with the crosshairs and where the BB hits, the scope is sighted in for that distance.
Many scopes for air rifles/pellet rifles/BB guns are going to be 4x15 and are specifically marked for pellet rifles and .22 rimfires. Many pellet rifles have a dove tail on the top of the receiver. Most small scopes like the 4x15 have an eye relief of about 3 inches. When mounting your scope, the scope rings will open up or clamp down on the dovetail on top of the receiver of the gun. Note that the dovetail is on the receiver and NOT the barrel itself. Slide the scope into the rings first and tighten it down just enough to where you can slide it and turn it somewhat easy but to where it isn't sloppy and not moving around. Now slide the scope onto the dove tail, aligning the bottom of the scope rings with the grooves on the dove tail. It may be a little trick getting it on there so open or close the screws on the scope rings accordingly. Slide it back almost all the way to the end of the dove tail, leaving about 3 inches or so between your eye and the scope. Turn the scope end that you are looking through (after loosening the retainer ring that holds it place) until the cross hairs are straight up and down and across (like a plus sign). When you are satisfied with the alignment of the cross hairs, re-tighten the retainer ring, careful not to turn the eye piece. (On some scopes, they are already aligned and you can skip this part.) Now, hold your UNLOADED rifle up to a point that will be your most comfortable shooting position. If you have the scope rings slightly loose, the scope should slide forward and backward. Position the scope while looking through it at a white object (makes it easier to see) at about 120-150 feet (40 - 50 yards) and to a point that when you look through it, you get a clear field of view and see no black inside the scope except the cross hairs. When you have it where it feels comfortable, about 3 to 3.5 inches away from your eye in the shooting position, carefully bring the rifle down and tighten all 4 screws on the scope rings. You are now ready to sight in your windage and elevation with your scope.
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Quote:
Originally Posted by Giesela
Ah ha! Those things - they aren't groves, they are raised things
So ok, the "grooves" start just above the back of the curved part, then stop where the opening for the pellet cartgridge fits then starts again.
How do I know how far forward or back to put the scope on the grooves? Straddle the opening? All the way forward of the opening? It just barely fits all the way back closest to the eye.
If you look into your tasco you will notice that if your eye is too far away from the scope you see a black rim around the image in the eyepiece. If you are too close you will notice that the image distorts. There will be a small margin in which the image is "perfect". That distance is the proper eye relief for that scope. When you put the bb gun to your shoulder, you want the scope to be that same distance from your eye. Make sense?
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