HELP! The screw that came with my Magpul AK grip doesn't fit.

[Ronin13]

Before I go asking one of the folks over at Home Depot I'd like to run it by you guys. So I bought a new grip for my WASR10, but the screw that came with the Magpul grip doesn't fit in the Tapco grip bushing. I'm guessing it's a difference between US and Metric? The screw goes in about 4 rotations, then stops as if too big. Any idea on the side needed?

[ray1970]

I'm guessing it has that thick thread lock stuff on it? You might try cleaning that off with a wire brush and try it again.

[T. B. Turner]

If the threads didn't match it most likely would not go in 4 turns before stopping. There is probably something obstructing the threads. Maybe a bur or a bad spot left from machining. If you can shine a light in there and take a look, that may reveal the culprit.

[buffalobo]

Is it possible to use the old screw from old grip?

[ray1970]

Is it possible to use the old screw from old grip?

Maybe. If he stacks about two inches of washers on it.

[Irving]

You can take the old screw to Depot to find out the thread type/size you need and but the approprite size/length you need.

[Alpha2]

Original is M6 X 100mm - 1.00 MM Pitch

the Magpul one will be shorter.

[Great-Kazoo]

The only thing he needs to do is remove the screw block from the rifle, hold it with one hand, install screw with the other. This allows one to see what and where the issues is. THEN he'll know if it's the hardware or block.
I'd go to your local hardware store (ACE) as they have thread blocks set up in the nut & bolt aisle. This way you can see exactly what you need before someone at HD or Lowes says. This looks like it "might work.

Does the OP have a thread pitch gauge on hand, tap's & die's? If not he as others who "tinker" with anything mechanical should consider investing in.

[ray1970]

Without thread pitch gauges, you can just lay the two bolts against each other to check the thread pitch. If they are the same pitch the threads will nest nicely inside each other. Not sure if that made sense the way I explained it. Maybe I'll post a picture.

[ray1970]

Here's a picture of what I'm talking about. When you compare the two bolts this way the high spots on the threads should nest nicely inside the low spots in threads of the other bolt. If they do, the thread pitch is the same. If not, they're different.