What is the point of 80 lowers?
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.
Are Polymer 80 lowers any good?
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.
Can you cast a lower receiver?
The process of pouring molten metal into a mold to get the desired shape is known as Casting. To ‘cast’ the lower receiver for an AR-15 rifle, the molten aluminum is poured into the mold. After the whole process is done, the finishing is done on a CNC machine.
How much does it cost to serialize a firearm?
The initial fee for submitting an application for a unique serial number is $35. This fee will cover the $20 cost for the firearms eligibility check conducted by the Department and the request for one unique serial number for one firearm through CFARS.
Are forged lowers better than billet?
Billet lowers tend to be heavier due to the excess material left on for design or aesthetics, however the weight difference when compared to forged is minimal. Most consumers tend to agree that the custom look of the billet is worth the ounce or so of weight gain.
Is billet aluminum stronger than cast aluminum?
Billet aluminum is generally considered a stronger material than cast. Billet parts are made from a single block of material that is machined down on a CNC mill. The result is a gorgeous part that can be made to match an engineer’s design with perfect precision.
Will 80% lower jig work on any lower?
The jig is made from a collection of aluminum and steel plates, with high-speed steel (HSS) bits provided for milling and drilling your 80% lower. Because the jig indexes the receiver via the pivot and takedown pin holes, it’s capable of completing an AR-15 or AR9 lower of virtually any shape.
What is a jig for Polymer 80?
The Polymer80 AR15 Universal Jig is designed with a super rigid long-fiber nylon composite, which will allow you to utilize the 80% lower jig up to 3 times. The Polymer80 RJ556U AR15/AR9 Universal Jig is designed to provide a stable platform for milling, and therefore encompasses the entire AR15 or AR9 lower receiver.