Auto-Ordnance 13 1/2-Inch Model 1927A5 .45 ACP Barrel

Description

For the shooter who values a piece of American firearms history that still delivers reliable performance on the range, the Auto-Ordnance 13 1/2-Inch Model 1927A5 .45 ACP Barrel offers a distinctive blend of classic design and modern NFA compliance. Whether you are a collector seeking an authentic Thompson-style platform or a target shooter looking for a stable, controllable .45 ACP carbine, this model provides a legal pathway to own a short-barreled rifle (SBR) with a storied pedigree. As a licensed FFL retailer, we understand the importance of matching the right firearm to your specific use case, and this model is built for those who appreciate straightforward mechanics and a proven cartridge.

Product Overview and Intended Audience

The Auto-Ordnance Model 1927A5 is a semi-automatic, short-barreled rifle chambered in .45 ACP, featuring a 13.5-inch barrel and a detachable walnut stock. This firearm is designed for a specific audience: responsible gun owners who are legally permitted to own an NFA item and who want a historically inspired platform for recreational shooting, home defense, or collection. It is not a concealed carry piece due to its size, but it excels as a stable, low-recoil carbine for the range or as a formidable home-defense option when paired with a 30-round magazine. Collectors will appreciate the direct lineage to the Thompson submachine gun, while target shooters will value the inherent accuracy of a fixed barrel and the manageable recoil of the .45 ACP round in a heavier platform.

Key Specifications Breakdown

• Caliber: .45 ACP (Automatic Colt Pistol)
• Barrel Length: 13.5 inches (measured from bolt face to muzzle)
• Overall Length: Approximately 30 inches (with stock extended)
• Capacity: 30-round detachable box magazine (included)
• Finish: Blued carbon steel barrel and receiver
• Stock: Detachable walnut with classic Thompson-style forend
• Weight: Approximately 7.5 pounds (unloaded)
• Sights: Fixed front blade with adjustable rear aperture (Lyman-style)
• Action: Semi-automatic, blowback-operated
• Safety: Manual thumb safety and grip safety
• NFA Status: Classified as a short-barreled rifle (SBR); all NFA rules apply

Feature Deep-Dive

The 13.5-inch barrel on this Model 1927A5 is a deliberate choice for shooters who want a compact profile without sacrificing ballistic performance. At this length, the .45 ACP round retains enough velocity for reliable expansion with defensive ammunition, while the shorter barrel keeps the overall package manageable in tight spaces. The blued finish provides a durable, corrosion-resistant surface that holds up to regular cleaning and range use, though it will develop a natural patina over time if not stored in a controlled environment.

The detachable walnut stock is a defining feature that transforms this firearm from a pistol configuration into a true SBR. When attached, the stock offers a solid cheek weld and a stable shooting platform, reducing felt recoil and allowing for faster follow-up shots. The wood is finished with a satin lacquer that resists moisture and minor impacts, and the stock attaches via a simple push-button mechanism that requires no tools. This design allows the owner to disassemble the firearm for transport or storage in a compliant configuration, provided the NFA rules for the SBR are followed.

Internally, the blowback operating system is straightforward and reliable. Unlike gas-operated designs, the blowback action uses the mass of the bolt and the resistance of the recoil spring to cycle the action. This simplicity means fewer parts to clean and maintain, and it is less sensitive to variations in ammunition power. The bolt is machined from solid steel and features a fixed firing pin, which is a hallmark of the Thompson lineage. This system has been proven over decades of use and is well-suited for the .45 ACP cartridge.

The included 30-round magazine is a reproduction of the classic Thompson stick magazine. It is constructed from stamped steel with a blued finish and features a removable floorplate for easy cleaning. The magazine feeds reliably with standard ball ammunition and hollow points, though we recommend testing your chosen defensive load for function. The magazine release is a paddle-style lever located at the front of the trigger guard, allowing for quick changes without breaking your grip.

The sight system consists of a fixed front blade and an adjustable rear aperture. The rear sight is click-adjustable for windage and elevation, allowing the shooter to zero the rifle for a specific distance. The aperture sight provides a clear sight picture and is well-suited for target shooting at typical range distances of 25 to 100 yards. For shooters who prefer a red dot or low-power scope, the receiver is drilled and tapped for a side-mount optic base, though this is not included.

The grip safety and manual thumb safety are both present, providing two layers of protection against accidental discharge. The grip safety must be depressed by the shooter’s hand before the trigger can be pulled, and the thumb safety blocks the sear when engaged. These controls are intuitive and have been standard on Thompson-style firearms for decades. The trigger itself is a single-stage design with a pull weight of approximately 5 to 7 pounds, which is consistent for a military-style firearm and allows for deliberate, accurate shots.

Ideal Use Cases

This Model 1927A5 is best suited for three primary use cases: range target shooting, home defense, and historical collection. For range use, the .45 ACP cartridge is affordable and widely available, and the 30-round capacity allows for extended shooting sessions without frequent reloading. The weight of the firearm and the blowback action absorb recoil effectively, making it comfortable for shooters of all experience levels. For home defense, the 13.5-inch barrel and detachable stock provide a compact package that is easier to maneuver in a hallway than a full-length rifle, while the .45 ACP round offers proven stopping power. Collectors will appreciate the faithful reproduction of the Thompson design, including the distinctive front grip and the classic walnut furniture.

Compatibility Notes

This firearm is chambered for .45 ACP ammunition only. It will function reliably with standard-pressure .45 ACP loads, including 230-grain ball, 185-grain target loads, and most hollow point defensive rounds. We recommend using factory-new ammunition from reputable manufacturers for best reliability. The 30-round magazine is specific to the Auto-Ordnance 1927 series and will not fit other .45 ACP firearms. Holsters are not commonly available for this model due to its size, but soft cases or rifle bags are appropriate for transport. Aftermarket accessories such as vertical grips, suppressors, and optics mounts are available from third-party manufacturers, but any modifications must comply with NFA regulations if they change the firearm’s classification.

Frequently Asked Questions

1. How does shipping work for this firearm to a U.S. address?
As an NFA-regulated short-barreled rifle, this item cannot be shipped directly to your home. It must be shipped to a Federal Firearms License (FFL) holder in your state who is authorized to process NFA transfers. Once the firearm arrives at your chosen FFL, you will complete the ATF Form 4 transfer process. We ship via insured, discreet packaging to your FFL within 1-3 business days after your order is placed and your FFL’s information is verified.

2. What is the FFL transfer process for an NFA item like this?
After purchasing, you must select a local FFL dealer who is willing to process NFA transfers. You will then submit a completed ATF Form 4 (with two sets of fingerprints and a passport photo) along with a $200 tax stamp payment to the ATF. Once the tax stamp is approved (current wait times vary by region), your FFL will notify you to pick up the firearm. We provide all necessary documentation to your FFL to initiate the transfer.

3. Is this firearm compatible with +P .45 ACP ammunition?
We do not recommend using +P or +P+ ammunition in this firearm. The blowback action and fixed barrel are designed for standard-pressure .45 ACP loads. Using higher-pressure ammunition may accelerate wear on the bolt and recoil spring, and could potentially cause functioning issues. Stick to standard-pressure loads for reliable cycling and to maintain the service life of the firearm.

4. What warranty is offered on this Auto-Ordnance Model 1927A5?
Auto-Ordnance provides a limited lifetime warranty to the original purchaser against defects in materials and workmanship. This covers the receiver, barrel, and internal components. The warranty does not cover normal wear and tear, damage from improper maintenance, or modifications by unauthorized gunsmiths. If you experience a defect, you can contact Auto-Ordnance directly to arrange for repair or replacement. We also offer a 30-day return policy for items that are defective upon arrival (see next question).

5. What is your return policy for NFA firearms?
Because this is a regulated NFA item, returns are only accepted if the firearm is defective and has not been transferred to you via Form 4. If you receive the firearm and find a manufacturing defect (e.g., cracked stock, non-functioning action), you must contact us within 7 days of receipt at your FFL. We will arrange for a return label and a replacement or refund. Once the Form 4 is approved and you take possession, all returns are handled directly between you and the manufacturer under their warranty policy.

Closing Call to Action

This Auto-Ordnance 13 1/2-Inch Model 1927A5 .45 ACP Barrel is available now for U.S. customers who are legally eligible to own NFA firearms. We ship to all states where SBRs are permitted, and we work with your chosen FFL to ensure a smooth transfer process. If you have questions about NFA compliance or the ordering process, our team is available to assist. Place your order today to add this historically significant and functional firearm to your collection.