I decided to build my first AR so I purchased a lower receiver from Arms-n-Ammo, and then bought a Daniel Defense LRPK from Midwest PX. I started with the magazine release button and catch. The problem is when I depress the mag release button it sometimes does not return all the way. I looks like the long bar part (I’m not sure what it is called, I think it’s the magazine catch) does not return back, it gets caught on the cutout in the receiver. It happens every 10-15 times I press the mag release. Do I need a dremel tool to grind off some of the bar or open the cutout?

 

Another question I have is on some parts of the receiver I see bare metal. Small scratches. Is this ok? Do I need to repaint (or is it a “coating” of some sort)?

 

Thanks

When you first assembled it how much did you tighten it, how many turns a couple or until you couldnt do any more?

I turned it till it was flush with the mag button

Tighten it more.

Yup, you need to get another couple turn or two of the magazine catch so that when you push the magazine release button with your finger the catch doesn't extend past that raised "circle" that is bisected by the magazine catch slot on the left side of the magazine well, like so:

 

 

The above is as far out as the catch should go when you press the mag release button with your fingertip. You should not be using the "point" of your finger to push the mag button deep into the channel, just the "fingerprint" part of your finger, so that the mag release button stops flush with the side of the magwell.

 

You may need to push the mag release button in with something longer/narrower than your finger that (like, say, a blunt end of sharpie marker)that will fit inside the magazine release button channel in order to get the clearance necessary for the catch to screw it on a few more turns.

Thamks I will try this whe I get home

If the anodizing has been worn/scratched off, you can use a Birchwood Casey blueing pen

If the anodizing has been worn/scratched off, you can use a Birchwood Casey blueing pen

 

Never used one will that work on aluminum ?

 

I have used paint for small scratches, get a good match and spray a puddle on something and dab a brush in it try it on a spot you wont see 1st

even a Sharpie might match