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ACI Review

Complete Review I have completed on the ACI M16 BCG and Bolt
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  Andro-Corp Industries Bolt Carrier & Bolt Review The Bolt Carrier Group (BCG) and bolt, the most underappreciated and overlooked part of any and all AR-15 style rifles. Why is a BCG and bolt so important? Without one your rifle is useless; without a good one, your rifle is also useless, so why is this topic so overlooked? This question has a simple answer, they all look the same and most people don’t shoot their rifles enough to know what it means to have a “good” BCG and bolt, but don’t worry, a small emerging company out of Florida has solved that problem and has a better than good BCG and  bolt, and better news is, you can actually afford it. Andro-Corp Industries “Who is Andro Corp Industries?” is probably what you’re wondering. ACI is a small firearms company based out of Ocoee Florida. To access their website visit and to visit their shop go to 364 Story Rd, Ocoee FL 34761. The owner, Josh Dewrell is a master at buildi ng AR’s and sells his uppers on -site and online. You can order from ACI everything from his Revolution 5.56NATO muzzle device for use on AR Pistols and SBR’s to full uppers and parts to build your own. Josh understands what it means to  be a responsible gun-owner in the United States. He understands firearms are more than just tools you can use recreationally, he understands these parts and firearms could be used to save  your life or the lives of those around you. This mindset in an owner reflects in the quality of  parts ACI puts out to the public. If ACI wouldn’t trust a part with their life, they wouldn’t sell it, it ’ s that simple. Bolt Carrier Group and Bolt Specs  Now for the feature product, the ACI A.O. Precision M16 BCG and Bolt. First, the specs: -M16 Carrier-8620 Hard Chrome Lined; -Bolt: Carpenter 158 High Pressure Tested and Mag Particle Inspected. Bolt is marked “HP/MPI”.  -Extractor: 4140 Machined. -80 Durameter black extractor spring insert with O-Ring. -Chrome plated firing pin. -Phosphated cam pin. -Staked gas key with mil-spec fasteners. -Chome-lined gas key. What do these specs amount to? This BCG and  bolt is entirely mil-spec, literally. Now, what is Mil-Spec? When the military looks for new parts or weapon systems they start with a rigorous test and specs benchmark the parts must pass before they can be considered. The M16 BCG and bolt has been around since roughly the 1960s, and it’s still around, and that’s no mistake. This same BCG you can order from ACI is the same BCG you could submit to the military today for trials, and yes, it would pass. Let ’ s start with the M16 BCG. Some may wonder, is it legal to have full-auto parts in my AR-15? The answer is yes! Yes it is, and its encouraged. What you get from having a full-auto M16 BCG is mass. The back part to an M16 BCG is full in that there is not cut to hinder it from engaging a full-auto sear. Now, with a semi-automatic rifle this would seem useless, however that is not the case. The benefit of having a full massed, full auto BCG is weight and reliability. This weight slows down the cyclic rate of the weapon slightly, but this slower rate accounts for  better reliability. Further, since the BCG is heavier it absorbs more recoil. Recoil management is essential when it comes to faster follow up shots and placing more precise, surgical hits down range. The phosphate coating of the BCG is also an advantage, but it can be a double-edged sword. The phosphate finish mitigates heat really well and holds up to temperature change however, when it comes to the fouling and carbon build-up that comes with shooting a direct gas gun, it can make for a hassle to clean. I wouldn’ t let this deter you though, with proper lubrication this is not an issue for reliability at all.   Next is the actual bolt. Think of the Bolt Carrier as the “  person ”  of the rifle, and the bolt as the “ heart ” . The bolt is what makes the rifle function. The bolt grabs and seats the round, allows the firing pin to strike the primer and allows for proper extraction of the spent cartridge. Without a bolt all you really have a really nice and expensive paper weight of a rifle. This bolt goes the extra mile, remember earlier I stated it was mil-spec, well now you will get to appreciate what all that means. This bolt is High Pressure Tested and Mag Particle Inspected. Every bolt that has gone through this process is stamped with a mark indicating HP/MPI (see circled area on the bolt pictured above  —  this is the bolt AFTER testing). Wh y is this done? It’s expensive and manufacturers want you to know the work they have put into their product. MPI and HP testing is a process where the bolt goes through a test to check for micro-fissures and cracks in the metal. These micro-fissures and cracks will eventually get larger under stress and could lead to a catastrophic malfunction. If the bolt shows no signs of cracks then it passes and it goes in your rifle, however if there is a crack the bolt is scrapped. The good thing about this? Your bolt is guaranteed, out of the box, to be 100% reliable and safe to operate in any condition. What makes this unique to other companies? Most other companies do not HP/MPI test every bolt they send out, to do so would be too time consuming and cut into profits. Most companies test one bolt out of a batch and if it passes, they all pass. Are you willing to take a chance on your life? I would think not, and Josh at ACI doesn’t want to either which is why he supplies HP/MPI stamped bolts. Finally, to conclude the specs discussion, lets discuss the gas key and chrome lining of the BCG. If the BCG is the “person” and the bolt is the “heart” think of the gas key as the “lungs”. I say this because the gas key’s function is to take the cycling  gas from the gas tube, capture it, harness it, and use it to push the bolt back to allow the bolt to extract the spent cartridge and strip a new round from the magazine when it returns home. If the gas key cant “breath” the “heart” or bolt, can’t functio n. The gas key sees more stress than any other  part in an AR. The gas key is subject to hot gasses and slamming into a gas tube over and over and over again. Having a properly staked gas key is essential to proper reliability. Staking is a process where the gas key is secured by mil-spec fasteners and then metal from the gas key is pinched over the fasteners to prohibit the fasteners from “walking out” (see   picture to the right  —  staking is shown in red circles  —  actual gas key after testing). This keeps the gas key secure and in the same position. If the gas key is in the same position it will have a consistent feed of gas from the gas tube furthering the reliability of the weapon. Typically what you see with non-mil- spec BCG’s is either a non -staked gas key, or a poorly staked gas key. Both of these options lead to the fasteners walking out allowing the gas key to move. This movement results in a gas key that will not properly mate with the gas tube which can lead to under gassing (causing a malfunction), or bending the gas tube making the weapon unsafe to operate. Good thing is, the ACI gas key is staked, and staked very well, so no need to worry. Many of us think about chrome and relate it to 18-wheelers or 22 inch wheels in rap videos, but did you know chrome plating is also used in ARs? Yes, even you can “bling - out” your rifle with chrome, but it’ll be done discreetly, and no -one will know you have it, until their rifle fails because they don’t. The ACI BCG and gas key is internally chrome -plated. The  purpose of chrome plating is three-fold; (1) It slicks up with a lot of oils; (2) It cleans easily and resists carbon build-up; and (3) Chrome plating reduces friction a.k.a. HEAT! So what does this mean for you, the consumer? It means your bolt is slick where it needs to be, cool when it needs to be, and always ready to rock and roll. Chrome plating plays a huge role in the feel of the rifle. Many of you have cycled a rifle that had a “sticky” or “gritty” action. Chrome plating the internals virtually eliminates this problem, even after say, 1,500 rounds. Testing  Now that you have some  background about ACI as a company and the BCG and bolt let’s get down to the testing. The  testing was conducted over about a 6 month period in all types of conditions. The testing was done in two rifles: (1) 14.5 inch mid-length BCM/PSA rifle (2L); and (2) 16 inch carbine length PSA rifle (1L)  —   pictured below. The purpose of using two different rifles was to see how the BCG and bolt  performed in two completely different systems. 1L, the 16 inch carbine length, is the most common AR style rifle in the United States, so naturally it was the rifle we had to test with the BCG and bolt. 2L, the 14.5 inch mid-length is the more competition oriented rifle with higher tolerances and more refined and tuned systems. If I was going to see a malfunction it was going to likely be in 2L. Many people argue shooting a mid-length gun with
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