Will not work with the New Frontier Armory .45ACP bolt, as it has geometry that makes it incompatible with the feed angle of H&K USC pattern magazines.
Visit MVB Industries
The MVB Industries AR-15 Pistol Caliber Billet Upper Receiver, Stripped, is the perfect platform for building your unique, mission-specific, 9mm, .45acp, 10mm and 40S&W AR-15 pistol caliber rifle/pistol. Made from a high-strength, 7075 T6 aluminum for durability. Mil-Spec, MIL-A-8625 Type III hardcoat anodized finish adds extra strength and delivers superior abrasion-resistance for rugged field use. Precision-machined to ensure drop-in installation of Mil-Spec, aftermarket components. Weight 7.8oz.
Will also work for .22 AR-15 rifles and pistols (AR-22)
Visit MVB Industries
MVB Industries AR-15 45ACP Magwell Adaptor is designed as a drop-in accessory for a standard AR-15 lower receiver and uses a standard H&K USC 45 caliber magazine.
QUESTION: Do I need to adjust my ejector?
ANSWER: Yes, before firing your new pistol caliber lower we suggest you adjust your ejector. Loosen the two screws holding the ejector in to where it becomes a semi-tight friction fit. Ensure the ejector is seated all the way to the rear and all the way down in the pocket. Close your upper onto the lower with the bolt all the way forward. SLOWLY cycle the bolt in and out about 1/4 of the way back a few times then let the bolt close all the way and tighten the ejector screws. They are cupped to get a good grab on the SS ejector, so only hand tight or you risk the chance of bending the ejector over. Any slight rubbing at this point will wear in the ejector after a few magazines are cycled through the gun. If you see excessive rubbing you can also file down the top corner on the left side of the ejector (shooters left). At this point you should remove one screw at a time without disturbing the ejector location and add loctite to the screws and tighten them back down. This will ensure the screws will not back out over time.
QUESTION: What type of magazines will fit in this lower?
ANSWER: The lower was designed to fit and drop free factory Glock large frame pistol magazines. Although it accepts and shoots other aftermarket magazines some slight modification may be needed to get them to drop free from this lower because of the varying width measurement we have seen when checking these magazines to Glock factory specifications.
QUESTION: Do you offer a reliable last round / empty magazine bolt hold open (LRBHO) System for this lower?
ANSWER: YES — After watching several companies try and fail to incorporate a RELIABLE last round bolt hold open (LRBHO) system into their lower receivers we decided to take a different approach and will be incorporating our LRBHO technology (PATENT PENDING) in our matching upper receivers. After rigorous testing and hundreds of hours of research and development we feel that this is the best option for LRBHO on a Glock magazine AR style firearm. Our upper will be compatible with other manufacturers lower receiver that either don’t have a LRBHO or you can scrap the non-working LRBHO out of your existing AR-45 Glock Mag lower and solve the issue of not having a 100% functioning LRBHO. For more information on our matching Pistol Caliber Upper, please CLICK HERE.
QUESTION: What bolt carrier group will work with a Glock magazine fed AR-45?
QUESTION: What LPK will work with this lower?
ANSWER: Although we sell a specific LPK with just the parts needed to build the C-45 lower receiver HERE, any standard AR-15 LPK will work. You will not need the magazine catch assembly, bolt catch roll pin, or trigger guard that are normally included with standard LPKs.
QUESTION: Do I need to use a special buffer when I build my AR-45?
ANSWER: It is advised that you use an 8 oz or heavier buffer. Lighter buffers aren’t safe to use in a blowback system with larger calibers such as the .45ACP and 10mm, and they may not feed some types of ammunition reliably without the added weight.
Visit New Frontier Armory
The Foxtrot Mike Products Extra Heavy Pistol Buffer FM-45 has internal Tungsten weights, to improve cycling of any blow-back operated AR-15 .45 pistol caliber carbine action. With its extended length, the FM Extra Heavy Pistol Buffer requires no spacer and helps prevent bolt catch breakage.
By installing this buffer, you’ll enjoy smoother function, less felt recoil, and reduced rate of fire from your AR pistol. The FM Extra Heavy Buffer is compatible with all 9mm and 45 caliber upper receivers. Foxtrot Mike’s FM Extra Heavy Pistol Buffer is the secret ingredient to make your AR-15 pistol reliable and smooth-cycling.
AR15 Carbine Buffer vs AR15 45acp Buffer – I like to be very visual in my explanations. One picture truly is worth a thousand words. In the picture above a standard AR15 Carbine Buffer is compared to a Heavy Buffers .45acp buffer. There is probably nobody that understands the AR15, AR10 and 308AR recoil system better than Slash at Heavy Buffers. The Heavy Buffers .45acp buffer at eight and a half ounces is a half ounce heavier than the eight ounce Hahn AR15 Pistol Caliber Carbine Buffer. Slash also recommends a Wolff Spring #16501 for maximum reliability. Visit Heavy Buffers for more information.
Note: Slash dimensions are proprietary. That is why they are not listed.
45acp AR15 BUFFER COMPARED TO AR15 CARBINE BUFFER
I felt is might be useful for some to see the difference in the 45acp AR15 HEAVY BUFFER compared to a standard ARMALITE AR15 CARBINE BUFFER. In the picture below the mass of the AR 45 buffer is pretty obvious. The 45 AR Buffer also weighs in at 5 ounces more than a standard AR15 buffer. The weight difference comes not only from the size but from the material used. The AR15 Buffer is aluminum and the AR 45 Buffer is made from very dense and heavy stainless steel. Make sure you buy the right buffer for your 45 caliber AR15 carbine, pistol or rifle.
AR15 BUFFER SPECIFICATIONS:
AR15 CARBINE BUFFER – 3 OUNCES 3.250″ Long
.45acp AR15 BUFFER – 8.5 OUNCES 3.750″ Long