Lapping Aluminum Scope Rings

When lapping separate scope rings i set them as far apart on the mounting rail as possible in order to provide the maximum lapping rod movement covered later. That s most likely the finish on the scope rings and a bit of metal coming from the interior of the rings during the lapping process. Slowly move the scope lapping tool back and forward along with a gentle twisting action.

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A lapping compound which is basically an abrasive liquid or paste is applied to the bar.

Lapping aluminum scope rings.

The base and rings are assembled on a steel lapping bar the abrasive compound silicon carbide aluminum oxide or alumina and boron carbide being commonly used is coated on the bar. So how is it done. Aluminum is anodized and lapping them makes them softer by removing the hard anodized outer layer. Brownells scope ring alignment lap is available in 1 inch and 30mm versions shown and includes lapping compound.

For the full length version of this and other midwayusa videos visit the midwayusa video library. So how is it done. The purpose for lapping the rings is to reduce any side loading flex on the scope. Screw the ring tops on but don t tighten the screws too snug.

There s no sure way to know when you re done other than looking and need to clean the interior of the rings for inspection more than once is a possibility. Lapping increases the surface contact between the scope tube and ring and aligns the scope rings. Uncoated steel especially stainless is a different matter. Http bit ly mrft9n lapping the rings on a rifle is a quic.

You can also improve the same area by having larger diameter scope bodies or thicker scope bodies. After 15 minutes of gentle action remove the two top scope rings and check. Work the lap in zigzags through the rings and in figure 8s or ovals as the surfaces smooth up and the lap moves more easily. The rings are tightened to the point where the bar can move but with slight resistance and the bar is worked back and forth.

But had i put the scope in those rings without reaming and lapping i would have probably ruined the scope. Slowly screw down the top scope rings to provide extra pressure on the scope lapping tool. Specifically applied to scope rings the user would assemble the base and rings with a steel lapping bar. Place the scope lapping tool onto the rings and screw down the two top scope rings gently.

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