Hello folks..... Yesterday, while I was driving down the highway ( yes, I know I should be paying more attention to my driving ! ) It occurred to me that I already have many, if not most of the parts to create an AR in 40 or 357 sig. I already have a 9mm AR that I really enjoy.

Does anyone have any experience with ARs in 40 ? Reliability? Special parts ? Recoil?

Suggestions and opinions are much appreciated ! thanks, mike

I built a 10.5 inch barreled pistol in 40 using Stern Defense parts. They have an adapter that goes in the mag well of a standard AR lower to take glock mags.

I like it. No issues I've come across. Recoil is a little more than 5.56. The Stern bolt is solid so you feel it a little more.

I've built two in 10mm and still have one. I prefer 10 over 40.

40 S&W ammo is all you can afford. Trust me. I have both.

quote:

Originally posted by 4MUL8R:

40 S&W ammo is all you can afford. Trust me. I have both.

Hand load, it's not that expensive.

I have a fair amount of trigger time behind a Beretta Cx4 Storm chambered in 40 S&W. I'd do it. At least the Beretta is accurate and very reliable.