
The Springfield Armory® 1911 Mil-Spec handgun is a modern take on the original G.I. 1911, which has been in service with the U.S. military for over a century. While the handgun is known for its classic design and reliable performance, there is some debate among enthusiasts regarding the use of plastic components, specifically the mainspring housing. Some prefer the traditional stainless steel housing, while others find the nylon plastic housing in certain models acceptable. This has sparked discussions about the advantages and disadvantages of each material, with some suggesting that plastic parts can be easily replaced with metal ones if desired.
| Characteristics | Values |
|---|---|
| Mainspring Housing Material | Plastic, Metal (Stainless Steel) |
| Mainspring Housing Style | Arched, Flat |
| Mainspring Housing Manufacturer | Springfield, Kimber, Remington, S A, Armscor, Stan Chen, Ed Brown, STI, Tisas, Rock Island Armory, Colt |
| Mainspring Housing Price | $75 - $156 |
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What You'll Learn

The Springfield ILS system
The Intrical Locking System (ILS) is a feature of Springfield's 1911 firearms. It functions as a lock for the gun, similar to those found on S&W revolvers and some early-2000s Remington rifles. The ILS is located in the mainspring housing and comes with two keys. While it is generally easily removable, some users have expressed concerns about disassembling the firearm without the ILS hole to relieve tension during the process.
Springfield has seemingly stopped including the ILS in their firearms, as some users have reported not seeing an ILS hole in their newly purchased 1911s. This change may be specific to certain states or regions, as there are mentions of California still having the ILS in their Springfield firearms.
The inclusion of the ILS in Springfield's firearms may be influenced by the wishes of anti-gun groups and import approval requirements. However, it is not a universal feature, and some users prefer to remove it due to concerns about its potential to malfunction or break.
While the ILS can be a divisive feature, it is designed to enhance the safety of the firearm, particularly regarding unauthorized access. Some users view it as a positive feature, especially when concerned about children or others accessing the gun. Ultimately, the decision to include or remove the ILS depends on personal preferences and local regulations.
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Metal vs. plastic mainspring housings
Mainsprings are an essential component of firearms, and the housing that contains them is a critical factor in the weapon's performance and durability. The debate surrounding metal versus plastic mainspring housings is a polarizing issue, especially for owners and enthusiasts of the iconic 1911 pistol. While some argue that the choice of material is a matter of personal preference, others vehemently defend the superiority of one over the other.
Plastic mainspring housings have been a subject of controversy among firearm enthusiasts, with some expressing disappointment and surprise when discovering that certain firearm models, including the 1911, feature plastic components. The preference for metal housings is often rooted in the belief that plastic parts do not belong in a firearm like the 1911, which is revered for its design and performance. This sentiment reflects a desire for an "all-metal" construction, with some users opting to replace plastic housings with metal alternatives, such as steel or aluminum.
However, it is important to acknowledge that plastic mainspring housings offer certain advantages. For instance, they help reduce weight, making the firearm more lightweight and maneuverable. Additionally, plastic housings are less likely to show signs of wear and tear, such as dings and scrapes, keeping the firearm looking newer for longer. Despite these benefits, some users remain skeptical, citing concerns about the durability and longevity of plastic components under prolonged pressure and stress.
On the other hand, metal mainspring housings are favored for their perceived durability and strength. Metal, particularly steel, is widely considered a superior material for firearm construction due to its inherent strength and resistance to cracking or splitting. Users who have experienced issues with plastic housings, such as cracking or failure, often opt to replace them with metal alternatives. However, it is worth noting that metal housings may be heavier, potentially impacting the overall weight of the firearm.
In conclusion, the debate surrounding metal versus plastic mainspring housings is multifaceted. While some users prefer the classic aesthetic and perceived durability of metal, others recognize the advantages of plastic, including weight reduction and resistance to cosmetic damage. Ultimately, the choice between metal and plastic mainspring housings depends on individual preferences, intended use, and the specific characteristics of the firearm in question.
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$26.99 $29.99

Stainless steel mainspring housing
The mainspring housing is an important component of a firearm, and the material used in its construction can be a matter of personal preference, performance, and cost. Some firearm enthusiasts prefer metal mainspring housings, considering them to be more durable and in line with the traditional design of the 1911 pistol.
Stainless steel is a popular choice for mainspring housings, known for its strength, corrosion resistance, and aesthetic appeal. It offers a sleek and modern look while providing robust performance. Stainless steel mainspring housings are available as aftermarket parts for those who wish to replace their plastic housings or upgrade their firearms. These housings are often designed to be drop-in replacements, making them easy to install.
Several companies offer stainless steel mainspring housings for the 1911 pistol, including Nighthawk Custom, which provides a range of options with different features and prices. For example, the 1911 Nighthawk Magwell, Carbon Tapered model, is priced at $35.99, while the T3 Magwell with Ball, Stainless Steel model, is priced at $59.99. These housings may feature serrations, checkering, or other textures to enhance grip and improve overall ergonomics.
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Steel arched MSH with lanyard ring
The M1911 handgun, developed by John Moses Browning, was first adopted by the military in 1911. The original model featured a smooth, flat mainspring housing. However, when the gun was modified into the M1911A1, the mainspring housing was arched with grooves. This arched design caused the gun to tip up slightly in the user's hand.
Some gun enthusiasts have expressed a preference for metal mainspring housings (MSH) over plastic ones. They argue that plastic parts do not belong on a 1911, and that the pistol is already a perfect mix of metal. Some gun models, like the SA Operator Elite 1911 10mm, come with a plastic flat MSH, which can be replaced with a steel arched MSH with a lanyard ring.
The lanyard ring was included in the original M1911 design per military specifications. It was added to both the pistol and magazines to prevent cavalry soldiers from losing them while mounted on horseback.
Installing a lanyard ring on an existing MSH is considered more challenging since it requires precise machining. However, this method allows gun owners to keep their custom or special MSH. On the other hand, purchasing a new MSH with the lanyard ring already installed is a more straightforward process as it only involves replacing the part.
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Mil-Spec handguns
The Springfield Armory® Mil-Spec handgun is inspired by the original G.I. 1911, which has been in service with the U.S. military for over a century. The Mil-Spec combines the best of classic and modern features, from its spur hammer to its arched mainspring housing. It is built on a forged frame and slide, carrying on the Springfield Armory tradition of quality 1911s.
The mainspring housing is a topic of debate among handgun enthusiasts, with some preferring metal and others noting the presence of plastic in some models. The Mil-Spec features the original arched style of the G.I.-issue 1911-A1, which is made of metal. Some handgun enthusiasts have expressed disappointment in plastic mainspring housings, stating that they prefer metal parts in their 1911s. They consider the 1911 to be the "perfect pistol," and believe that adding plastic takes away from the magic of the metal mix.
However, some manufacturers, such as STI, have used plastic mainspring housings in their single-stack carry 1911s without any issues. Additionally, some handgun owners have noted that while they prefer metal, the presence of plastic mainspring housings would not deter them from purchasing a handgun if it was a good deal, as it is a simple process to replace the plastic with metal.
The Springfield Armory Mil-Spec handgun is a true classic that combines modern upgrades with the traditional style of the original G.I. 1911. While there may be varying opinions on the material of the mainspring housing, the Mil-Spec's arched mainspring housing is made of metal, staying true to its rugged and authentic roots.
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Frequently asked questions
The Springfield 1911 mainspring housing can be either plastic or metal. Some people prefer metal, but plastic is also considered to be functional.
Metal mainspring housing is considered more durable and long-lasting than plastic. Plastic is considered a more cost-effective option.
Yes, it is possible to replace the plastic mainspring housing with a metal one. It is a straightforward process and can be done by ordering a metal replacement and fitting it.











































