Woo Hoo my RMR AR is reliable

[sstewart]

I built this 10mm from a RMR Extreme upper in 16". Used a Glock mag lower. I have had it for at least 18 months. Couldn't stop the FTFs with stock Glock mags. Tried Korean .45 mags with pinched feed lips. Tried grinding out the back of the STD 15 round mags.

Bought 2 mags on GB that where 10mm in 26 rounds each. Loaded some HAP rounds instead of the coated rounds and viola.

2 full mags dumps and zero FTFs.
This gun shots like a laser. (Always has) Like standing freehand 26 of 26 rounds in 8" circle at 50 ft.   

I don't know if I finally shot enough to break in the feed ramp. But it feels
Like the geometry is just right on these mags.


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[cwlongshot]

I had much difficulty with a Freedom shop lower in 40. (Receiver dont know what caliber it is.) The design on mine had a ejector clamped it with four grub screws. Two to hold and two more to hold first two. Well the darn ejector also determined the mag position and what do ya do with a mag?? Rap the bottom to feed the gun!  Well no matter what it eventually moves that ejector to the point ammo is feeding into the top edge of the chamber and as Blow Back AR's dont have a true feed ramp... FTFs where abundant.

I finaly discovered what was occurring and pinned the ejector in and problems disappeared. Crappy design. Now the gun is far better still dosent
Like some OAL's and certain bullets. But I have been lucky as what I "want to" use has been good.

HAP bullets are slick feeders for sure! The LEE 175 TC has proven head and shoulders better then the TL version. (For me)

I dont have a 10, mine is a 40. My 10 is a Mec Tech and has had zero issues feeding. But requires a firm hand to make Shoot. Hold it loose and thats how it shoots. Snugnit up and hold it like your sweethart and she will drill holes for ya. . 

Glad ta hear you figured her out!! Id like a 10 but think a 45 is next for me.

CW

[sstewart]

FYI
Used quarter circle 10 AR lower. Removed the ejector because this was direct impingement AR (gas).

SGM 30 round mags


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