Plum Crazy polymer lower assemblies?

[stanc]

Anybody used one to build a Grendel?

[Ridgerider]

Dont do it plastic lowers do not belong on real rifles.

[RStewart]

I have one on my 16" tactical for deer hunting. Works well and keeps the rifle light. I also have another on a CMMG upper. Ive put several hundred rounds through mine with no issues. Its fine for plinking and hunting. I'm not sure how well it would do under "combat" conditions. But since I'm not in combat, it's a moot point.
Most who put them down have not actually owned one. The lower does not heat up, so being made out of polymer is not a concern. If you don't like the polymer trigger, it is easily changed out. IMHO.

[stanc]

Dont do it plastic lowers do not belong on real rifles.

Ha! That's funny, because I always thought real rifles didn't have aluminum receivers and plastic stocks/hand guards/pistol grips.

Wood and steel, yessir. That makes a real man's rifle!

[stanc]

I have one on my 16" tactical for deer hunting. Works well and keeps the rifle light. I also have another on a CMMG upper. Ive put several hundred rounds through mine with no issues.

Thanks! That's interesting to learn. I was looking at one at the gun shop today, and the store owner told me that after a while the polymer parts start breaking. I'm not sure whether or not I'd shoot it enough to reach that point.

[RStewart]

Thanks! That's interesting to learn. I was looking at one at the gun shop today, and the store owner told me that after a while the polymer parts start breaking. I'm not sure whether or not I'd shoot it enough to reach that point.

Yeah, you could make the same statement about just about anything since "after a while" does not denote a real timeline. I would be curious as to what polymer parts breaking he refers to? Again, was this heresay or his actual experience. Not putting him down, just looking at perspective.

If you get one, you may have to do a little sanding to fit your receiver. Mine fits nice and tight with no movement. The trigger is a crisp, too. I had a couple of High Power shooter friends check it out when I first got them and both commented on how crisp it was. I have fired 30 round mags through it as fast as I would through any of my other AR platforms and had no FTE or stovepipes. YMMV

Rick

[leopard6.5]

Stan: Sorry I didn't respond earlier but I had to dig around for an issue of Guns and Ammo's Book of The AR-15 where I thought I had read an article about the Plum Crazy Firearm's lower receiver.
Sure enough, in the Spring 2011 issue, David Fortier wrote an article titled " PCF'S New Lower Receiver Assembly, Just Plum Crazy Inexpensive."
He states a fully assembled lower receiver was $119.00
He ran five different uppers( .22 LR, 5.56x45mm, 6.5x38mm Grendel, 7.62x25mm, .458 SOCOM) on it with no problems other than some of his aluminum GI magazines would not drop free but his other mags ( Magpul, Lancer, Tangodown) worked just fine.
He seemed pretty happy with the lower especially for the price.

Hope this helps.
Good Luck.

Lee

[Ridgerider]

I have seen at least two that have broken one at the take down pin and the other where the buffer tube mates to the lower. Both had less than 500 rounds through them. As for steel and wood if I thought that way I would not fly in an alloy and carbon fiber airplane only a Wright brothers design with wood, canvas and steel. Plastic used in the way it is used in some guns with reinforcement is fine but without the reinforcement and where it is, NO. Hand guards, stocks and pistol grips are ancillary and are readily accepted and replace easily and do not affect the workings of the rifle ie fire control.

[bwaites]

I remember when polymer handguns came out and NO ONE thought they would last, either.

Can they break, yes. But I've seen regular lowers be out of spec, lose retention pins, etc. too. I've seen the threads work loose on buffer tubes and become stripped.

Polymer lowers are just an extension of the polymer handguns and the fiberglass/polymer/carbonfiber revolution we see with bolt guns as well. There are a lot of "plastic fantastic" bolt gun stocks out there, and they seem to be fine.

The AR is a little weird in that the trigger group is located by pins passing through the lower, but similar setups on pistols are fine.

If you accept the inherent advantages (light weight, price, etc.) and understand potential problems and monitor them, I think it would be an interesting experiment.

The vast majority of Glocks sold in the last 30 years are STILL serviceable, polymer can't be too bad!!

[RStewart]

The bottom one is the 16" AA on a Plum Crazy Lower
The top one is my 20" AA Hunter with WCI Brake. Nothing fancy, but very functional


This is the CMMG upper on a Plum Crazy Lower