Are polymer lowers OK?
Yes, polymer 80 lowers are quite good. Our customers have loved them for quite a few reasons: They’re more affordable than metal lowers and jigs. They’re easier to machine and build with. They’re capable of taking some real abuse, as any good AR should.
What are uppers and lowers?
The upper and lower receivers are simply the two halves of a receiver in the AR-15/M-16 family of firearms. In a two-piece type firearm, the upper carries the barrel and the bolt, while the lower carries the firing mechanism and the magazine.
What are Lowers made of?
The most important part of the AR-15, the lower receiver (the firearm itself) is most often made from two types of metal alloys: Billet (6061-T6) and forged (7075-T6) aluminum.
What is the best material for a lower receiver?
Forged aluminum is the strongest type of lower receiver on the market. Forged lower receivers are stronger because of how forging works. Due to the pressure applied to the lower receiver the grain follows the same overall shape.
Are forged lowers better?
Forged Advantages: In conjunction, forged lowers are typically lighter (though marginally) due to their design differences and tolerances when compared to billet lowers. Forged lowers are also easy to find, as well as the most commonly sold style of lower. A finished (and anodized) 80% forged receiver.
What calibers can be built on AR-15 lower?
The AR-15 rifles usually comes chambered for either the military cartridge 5.56×45mm or the . 223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as . 223 Rem, since this can result in damage to the rifle or injury to the shooter.
What companies actually make AR lowers?
Best AR-15 Lower Receivers
- Palmetto State Armory. Simple forged lowers for a great price, they also offer a host of complete lower options for basically every type of AR-15 you can think of.
- Anderson Manufacturing. Here it is, the Honda of lower receivers.
- Aero Precision.
What type of 80% lowers are there?
Types of 80% Lowers (AR Platform)
- Forged AR-15 Lower, Anodized or Raw.
- Billet AR-15 lower, Anodized.
- Billet LR-308 lower, Raw or Anodized.
- Billet AR-9 lower, Anodized.
- Polymer80 AR-15 and LR-308 Lowers and Jig.
- JMT AR-15 Polymer 80% Lower and Jig.
What’s better forged or billet?
The fact is that forging forms a tougher, stronger product than machining, which is what billet parts are (they’re cut from a block of metal).
What’s missing in an 80 lower?
An 80% lower is an un-serialized receiver blank, an unfinished firearm that is not operable and cannot be made to operate without additional fabrication. An un-finished 80% lower cannot accept a trigger, hammer, or safety, so it can’t be made to fire a live round.