Pickup some Trail Boss powder for subsonic performance in your AR platforms. I recently purchased the pictured 5lb Trail Boss keg for $119, to reload 300AAC and other rifle calibers to be used suppressed. Due to the "donut shaped" flake design of this powder, 5lbs will go a long way in rifle loads. The YouTube video below illustrates different suppressed high powered rifle sound levels you can achieve in AR single shot mode. As the video highlights, the lower pressures will not cycle your bolt. Any bullet rated less than the speed of sound results in the bullet not making the normal crack-bang noise that occurs when the bullet travels past a speed of 1050 fps. Trail Boss allows you to reach your desired fps at muzzle, for a much lower sonic signature. If you're like others that are waiting for a Form 4 approval, continue to stock up on threaded barrels, powder and reloading supplies that you'll need when your suppressor arrives.
If you've been putting off building an AR10 because of cost, now is your chance to purchase several quality AR10 lower receivers at a great price of only $159.99 at the following link, PSA PA10 .308 Stripped Lower Receiver. These lowers are extremely well manufactured forged lowers made using 7075-T6 aluminum alloy. PSA has also streamlined their FFL transfer process by providing a list of all the FFLs in your area based on a simple zip code search at checkout. I encourage everyone to purchase multiple AR10 lowers for current and future builds. Thank you PSA for always offering industry leading products at a great price!!!
The following mounting and zeroing procedures for the MATECH Backup Iron Sight (BUIS), PN 12996812, NSN 1005-01-484-8000 are included with the sight and are provided for reference due to the number of used sights being resold without the original documents.
Mounting Instructions: Backup Iron Sight (BUIS):The BUIS must be mounted in the rearmost slot on the upper receiver for the range adjustments and the zeroing procedures to be correct. Using the Locking Bar, PN 12996823, NSN 5305-01-484-7999, and the Recoil Screw, PN 12996824, NSN 5305-01-484-7075, align the Recoil Screw in the rearmost slot with the range scale facing rearward. Make sure the BUIS is flat on the receiver rail with the angled edge under the upper receiver rail. Tighten the screw until the BUIS doesn't slide forward or rearward by hand force, then tighten an additional 1/4 turn. Do not over tighten. The Recoil Screw has a locking patch on the threads so it must be replaced if removed.
To zero the M4/M4A1 Carbine, turn the range knob until the line on the sight cam on the left side is aligned with the 300 meter mark. Use the 25-meter zero target for the M4 Carbine and center your rounds by adjusting the weapon front sight post and the BUIS windage adjustment knob.
To zero M16A4 Rifle, turn the knob until the line on the sight cam on the left side is aligned with the white line between the 300 and 400 marks. This mark is a half notch location, so it's more difficult to align. Use the 25-meter zero target for the M16A2/M16A4 Rifle and center your rounds by adjusting the weapon front sight post and the BUIS windage adjustment knob.
**25 Meter Zeroing Targets can be accessed by downloading a copy of FM 3-22.9 Rifle Marksmanship M16-/M4 - Series Weapons from the Official Department of the Army Publications and Forms website located at: http://armypubs.army.mil/. The M16 and M4 zeroing targets are designed for the unique sight adjustments required for each weapon system.
To engage targets out to 600m purchase USGI Backup Iron Sights (BUIS) that incorporate elevation knobs that can be quickly adjusted from 200 to 600 meters. Most rear backup sights allow for windage adjustments only, requiring the weapon's front sight post to be moved up and down to adjust for elevation during zeroing for 300M. A rear BUIS with elevation knobs provides the flexibility to engage targets out to 600 meters and is essential when optics are rendered useless. Pictured is a side by comparison between a Magpul Gen 2 MBUS (no elevation knob), and two USGI BUIS systems the Matech BUIS and Knights Armament Company (KAC) 600M USMC Micro Rear Sight assembly. Both USGI BUIS are military issue for use on both the M4 and M16 rifles. Although the USGI sights are pricey the ability to adjust elevation is well worth the cost. All three of the pictured sights are designed to be used with ARs that incorporate the standard "F" marked A2 front sight tower designed for uppers that use a Picatinny rail system. If your AR has a front gas block (optics only) you'll need to purchase a matching front BUIS designed for the same height.
When buying AR barrels or upper assemblies ensure the barrel used has a steel rating of at least 4140 as outlined by the Society of Automotive Engineers (SAE) steel grades table. The first two numbers 41xx reflects the material is an alloy consisting of chromium and molybdenum, or better known as chrome-moly steel. The second set of numbers in the 4140 reflects the carbon content of the barrel. The more carbon the harder the barrel. Most military applications require barrels to rate at least 4150 for increased durability during full auto fire. If you have the funds, purchase a barrel that includes the addition of "Vanadium" in the alloy which is usually marked as CMV, or stated as chrome-moly vanadium. Vanadium increased hardness and provides additional thermal erosion resistance required for sustained full auto fire. Cheaper barrels or uppers on the market are likely to exclude the better quality steel to keep costs low. Be aware of what you're purchasing. Use this information as a way to start the discussion when conduction your next AR build. Below is a quality upper assembly being sold by JSE Surplus that provides an example of a CMV barrel, and is being offered at a great price. Pick one up soon, these prices are not going to last long.
Federal is selling a significant amount of M80 7.62x51 ammunition at most large and small hunting stores for $16 per box of 20rds. This is a great NATO quality round for your 308 rifles and provides a strong case for reloading. When this ammunition is sold commercially an "X" is added to the military nomenclature to signify it is not being sold for military use, re-designating the cartridge as "XM80." This ammunition is normally linked for use in our military's medium machine gun (M240B) which is used by our infantry forces and also used as a coaxial machine gun (M240C) mounted in armored vehicles. To provide additional information about the M80 cartridge and other NATO 7.62 ammunition hitting the civilian market, the following narrative and diagrams are from FM 3-22.68 Crew Served Machine Guns 5.56 and 7.62 (July 2006).
The M240B machine guns use several types of standard 7.62-mm ammunition. Figure 3-3 shows the types and their characteristics. Soldiers may only use authorized ammunition manufactured to US and NATO specifications. Ammunition for the M240B is issued in a disintegrating, metallic, split-linked belt (Figure 3-4).
The M240B machine gun uses the following types of ammunition. See also table 3-3:
• Cartridge, 7.62-mm Ball M80—for use against light materials and personnel, and for range training.
• Cartridge, 7.62-mm Armor-Piercing M61—for use against lightly armored targets.
• Cartridge, 7.62-mm Tracer M62—for observation of fire, incendiary effects, signaling, and for training. "When the gunner fires tracer rounds, they mix with ball ammunition in a ratio of four ball rounds to one tracer round."
• Cartridge, 7.62-mm Dummy M63—for use during mechanical training.
• Cartridge, 7.62-mm Blank M82—for use during training when simulated live fire is desired. The gunner should use a blank firing adaptor (BFA) to fire this ammunition.
A recent trend is the limited availability of AR Lower Parts Kits (LPKs) at local gun stores. As more and more people purchase AR lower receivers, they are having trouble finding LPKs for future AR-15 builds. The picture below is a screen shot from Midwayusa.com showing their current LPK offerings. If you have a lower receiver with no parts to go with it go ahead and purchase any of these LPKs today. These parts kits are reasonable priced and are great quality. JSE Surplus is also carrying a large volume of LPKs. Continue to encourage your friends to purchase AR-15s and components in order to increase the number of owners of this essential weapon system. As a reminder, do not be caught off guard again if there is a run on guns like seen last year. All AR-15 and AR-10 components are a sound investment. Keep stocking up. Be Ready!!
Pictured below is a comparison of the different length gas direct impingement systems included on AR platforms. From top to bottom the picture reflects a Standard Length gas system (AR-15A2), a Mid-Length gas system (16in barrel) and a Carbine Length gas system (16in barrel). For overall performance it is recommended to stick with standard or mid-length gas systems due to their lower gas pressure at the barrel's gas port that results in less recoil, less wear on parts, more reliable round extraction and ejection. The system comparison allows the viewer to see where the barrel gas port/block is located for each of the systems.
Pictured is an AR15 assigned to a designated marksman. As discussed your fire team's designated marksman is required to provide precision fire outside the 300 meter range expected of all rifleman.
The pictured system incorporates the following to increase accuracy.
1. Timney Trigger #667s with 3 pound pull.
2. 18 inch barrel with free float tube and "Standard Length Gas System." Mid or standard length systems decrease recoil.
3. Magpul PRS (Precision Rifle/Sniper) Adjustable Stock.
4. Midwest Industry Flip-up Rear and Front Sight.
5. Harris 1A2-BRM Solid Base 6 - 9-Inch BiPod.
6. MAGPUL Battery Assist Device (B.A.D.).
7. BLACKHAWK AR-15 Ergonomic Grip.
8. 20rd MAGPUL magazine (not pictured).
If cost is a current concern, build out an additional upper or purchase a complete upper with at least a "Mid or Standard Length gas system and free float tube." You can always swap out the upper assembly with another AR's lower. Get started today, on any additional builds as parts and components are inexpensive.
Prior to spending $180+ on weapon accessories, your money is better spent on a good trigger. For AR platforms you can't beat the performance of Timney's single stage triggers for their unmatched smooth pull and crisp break. Timney triggers are designed as a drop in module that can be installed by anyone with their included easy to follow instructions. Pictured is a side by side comparison between my Timney trigger (#667 with 3 pound pull) and the standard military trigger I replaced. This trigger module installs using your AR's original hammer/trigger pins and is firmly seated in the lower receiver with the system's locking screws. Timney triggers are made in the USA and offer great customer service to answer any questions you may have. You can normally find a wide variety of Timney triggers on Ebay at a significant discount versus other vendors. Bottom line - A good trigger is the most valuable investment anyone can make to increase accuracy.