The Colt Series 70, launched in 1971, features a distinctive collet bushing design with longitudinal cuts for enhanced barrel fit and accuracy. You’ll find it weighs 36 ounces unloaded, sports a 5-inch barrel, and comes chambered in 9mm Luger or .45 ACP with 9+1 capacity. The pistol’s simpler internal design, lacking a firing pin safety block, delivers a cleaner trigger pull compared to later Series 80 models. The platform’s proven military heritage and performance characteristics reveal an intriguing evolution in 1911 design.
Key Takeaways
- The Colt Series 70 pistol features a distinctive collet bushing design with longitudinal cuts for improved barrel fit and accuracy.
- Introduced in 1971, it has a simpler internal design without a firing pin safety block, resulting in a cleaner trigger pull.
- Original models are valued between $800-$1,100, while new production models with dual recoil springs cost $1,000-$1,300.
- The pistol weighs 36 ounces unloaded, features a 5-inch barrel, and comes in 9mm Luger or .45 ACP chambering options.
- Series 70 models have fewer components than the later Series 80, prioritizing simplicity and performance over additional safety features.
Description
The Colt Series 70 pistol rolled out in 1971, featuring a distinctive “collet” bushing design that set it apart from earlier 1911 models. You’ll notice the original Colt’s collet bushing incorporates longitudinal cuts that provide a tighter barrel fit.
Series 70 pistols maintain a simpler internal design without a firing pin safety block, resulting in a cleaner, more responsive trigger pull compared to later variants.
Price Range
When shopping for a Colt Series 70 1911, you’ll find pricing varies significantly based on production era and condition. The original Series models from 1981-1983, lacking the Series 80 firing pin block, typically command $800-$1,100. Current Colt production models with dual recoil spring systems range from $1,000-$1,300 new.
| Variant Type | Price Range | Key Features |
|---|---|---|
| Original MK IV | $800-$1,100 | No firing pin block |
| Preowned | $700-$1,200 | Condition dependent |
| New Production | $1,000-$1,300 | Modern upgrades |
| Custom Modified | $1,500+ | Enhanced features |
Specifications
You’ll find the Series 70’s core specifications center on its 36-ounce unloaded weight and 5-inch barrel configuration. The pistol offers chambering options in both 9mm Luger and .45 ACP, maintaining a 9+1 round capacity in its single-stack magazine format. The construction combines G10 synthetic grips with a blued steel frame and slide, complemented by Novak adjustable rear sights and a fiber optic front sight.
| Specification | Details |
|---|---|
| Dimensions | 8.5″ Overall Length, 5″ Barrel |
| Weight | 36 oz (Unloaded) |
| Capacity | 9+1 Rounds |
Weight
Original Series 70 pistols weigh 36 ounces unloaded, striking an optimal balance between controllable mass and practical carry weight.
The Series 70 GOVERNMENT MODEL maintains this precise weight specification, which was established years ago during its 1981-1983 production run.
You’ll find the original pistol’s weight complements its simplified internal design, featuring fewer components than later iterations due to its streamlined collet bushing system.
Barrel Length
The Colt Series 70’s 5-inch barrel length stands as a hallmark specification of this classic 1911 design. Since its 1971 debut, this optimal barrel measurement has proven ideal for carry, competition, and hunting applications.
You’ll find the 5-inch configuration delivers the perfect balance of velocity and recoil management while maintaining excellent maneuverability – a key reason why it’s become the standard for full-size 1911 pistols.
Material Made Out Of
Constructed with premium-grade materials, Colt’s Series 70 pistol features a blued steel frame and slide that provide both durability and classic aesthetics. You’ll find the robust stainless steel components complement the G10 synthetic grips, creating a balanced weight of 36 ounces unloaded.
The 5-inch barrel and 8.5-inch overall length showcase the precision engineering of this time-tested design.
Chambered In
Building upon its robust construction, Colt’s Series 70 offers versatile chambering options in both 9mm Luger and .45 ACP configurations.
When you’re selecting your Series 70, you’ll find these two popular calibers provide distinct shooting experiences. While Wilson Combat magazines function seamlessly in both variants, the .45 ACP maintains the classic 1911 heritage, and the 9mm offers enhanced capacity with the same trusted platform.
Capacity
Consistent across both caliber variants, Series 70 1911 pistols feature a standard 9+1 round capacity, meaning you’ll have nine rounds in the magazine plus one in the chamber.
Colt’s Series 70 maintains this traditional magazine capacity whether you choose the 9mm Luger or .45 ACP version. This standardized capacity configuration aligns with the classic 1911 platform specifications, making the new Series 70 a faithful continuation of the full-size 1911 design.
Trigger Pull
The original Colt MK IV Series 70’s trigger mechanism sets a high standard with its smooth 4.75-5 lb pull weight and rapid reset characteristics. While current production Series 70 triggers exhibit more creep and grittiness compared to their predecessor, Colt’s Series 80 models now deliver superior trigger performance.
You’ll find that modern gunsmithing techniques can enhance Series 80 triggers to match the original Series 70’s renowned quality.
Safety?
Standard safety features on a Series 70 include a firm left-side thumb safety and well-designed beavertail grip safety that work in tandem to prevent accidental discharge.
While not ambidextrous, the slide lock safety is sharp and positive in engagement. You’ll find the magazine catch and slide lock are precisely fitted, and the dual recoil spring system enhances control during firing.
Action
Building upon its robust safety mechanisms, Colt’s Series 70 operates with a single-action, short-recoil system that’s become a benchmark in 1911 design. You’ll find the collet bushing enhances accuracy during field stripping and reassembly.
The dual recoil spring assembly effectively manages recoil, while the 4.75-5 lb trigger pull delivers a smooth, precise break with quick reset characteristics that experienced shooters demand.
Optic Ready?
Classic Series 70 1911s arrive from Colt without factory optic mounting options, reflecting their traditional pre-red dot sight design heritage.
If you’re planning to mount a modern red dot sight, you’ll need custom milling of the slide to accommodate an optic mounting plate or direct attachment interface.
Colt doesn’t produce an optics-ready variant of the Series 70, making aftermarket modification your only path to red dot capability.
Review
You’ll find the Series 70’s simplified design offers smoother trigger pull and enhanced accuracy through its innovative collet bushing system.
While the pistol lacks the firing pin safety block of later Series 80 models, many shooters consider this an advantage for competitive shooting due to the crisper trigger break and fewer moving parts to maintain.
The Series 70’s proven reliability stems from its robust construction and straightforward mechanism, though you’ll need proper maintenance of the collet bushing to preserve its accuracy potential.
Pros
While many modern 1911s feature complex safety mechanisms, the Colt Series 70’s streamlined design offers distinct advantages for both collectors and shooters. You’ll appreciate the enhanced trigger performance thanks to its simplified internal components and lack of firing pin safety block. The collet bushing design improves accuracy, while the trigger delivers minimal creep and superior feel.
| Feature | Benefit | Performance Impact |
|---|---|---|
| Collet Bushing | Better Accuracy | Tighter Groups |
| No Safety Block | Cleaner Trigger | Less Creep |
| Simple Design | Gunsmith Friendly | Enhanced Tuning |
Cons
Simplicity in design carries inherent trade-offs, and the Series 70 Colt exhibits several notable drawbacks. You’ll find the lack of modernity evident in its basic safety features and manual operation.
| Component | Limitation |
|---|---|
| Trigger | Grittier feel in current production |
| Bushing | Solid design vs. original collet |
| Safety | No ambidextrous option |
| Pin Block | Absent firing pin safety |
| Assembly | Separate recoil spring/guide rod |
These limitations reflect the Series 70’s traditional engineering approach, which prioritizes mechanical simplicity over modern conveniences and safety features.
Reliability
The Colt Series 70’s reliability stands as a testament to its time-tested design, consistently delivering over 600 rounds without malfunctions. You’ll find its dual recoil spring assembly enhances performance while managing recoil effectively.
The Series 70’s longevity in law enforcement and military utilization proves its dependability. For optimal reliability, you’ll need to maintain proper cleaning schedules, ensuring sustained performance throughout the pistol’s service life.
Similar Models
Since its introduction in 1971, manufacturers have created numerous variations based on the Series 70 design, most notably the Series 80 that emerged in 1983.
You’ll find the key distinction in the Series 80’s added firing pin safety block, which uses four additional parts. While some manufacturers now favor the Series 80 approach, others continue producing Series 70-style pistols for those preferring the original trigger characteristics.
Similar Models From Other Manufacturers
Following Colt’s successful Series 70 design, multiple manufacturers entered the 1911 market with their own interpretations.
Market trends sparked Sig Sauer to introduce their Tactical Operations model, while Kimber developed the Custom II. Smith & Wesson launched the E-Series with modern upgrades, Springfield Armory focused on competitive shooting with their Range Officer, and Ruger created the cost-effective SR1911 line.
Maintenance
Proper maintenance of your Series 70 Colt pistol requires systematic cleaning and inspection procedures to ensure reliable operation. You’ll need to clean the barrel, chamber, and moving parts with solvent and a bore brush. Apply high-quality gun oil to friction points and rails.
For proper care, inspect the firing pin, recoil spring, and controls regularly. Every few hundred rounds, perform a complete disassembly for thorough cleaning.
History
The Colt Series 70 made its debut in 1971, introducing a revolutionary collet bushing design that set it apart from previous 1911 models. The design evolution featured fewer components than its successors, prioritizing mechanical simplicity and enhanced accuracy through its innovative barrel-to-bushing fit.
You’ll find this model lacks the firing pin safety block that would later become standard in the Series 80, maintaining the original’s streamlined architecture.
Frequently Asked Questions
Is the Colt Series 70 a Good Gun?
You’ll find reliable performance in this classic design. The Series 70’s collet bushing system enhances accuracy, while its trigger mechanism offers a smooth, crisp break without extra safety components.
You’re getting a straightforward, well-engineered pistol that honors Browning’s original 1911 blueprint. If you’re seeking a traditional 1911 experience with time-tested mechanics and proven functionality, you’ll appreciate the Series 70’s simplified internals and superior trigger characteristics.
What Year Was the Colt Series 70 Made?
You’ll find that Colt began production of the Series 70 in 1971, marking a significant milestone in 1911 pistol manufacturing.
The production dates ran from 1971 until 1983 when Colt transitioned to the Series 80 design. During this period, you’d see the distinctive collet bushing system that helped improve accuracy.
If you’re looking at original production models, they’ll fall within this 12-year window, though modern reproductions have been made since.
What Is a Series 70 Colt 1911?
As they say, “the devil’s in the details.” You’ll find the Series 70 1911 represents internal design improvements Colt introduced in 1971. The distinguishing feature is its collet bushing system, which creates a more precise barrel-to-slide fit.
You’ll notice it lacks the firing pin safety block found in later Series 80 models, resulting in a crisper trigger pull. The Series 70 designation now commonly refers to any 1911 without the firing pin safety mechanism.
What Is the Rarest Colt 1911?
You’ll find that the rarest Colt 1911 is the MK IV Series 70 with the 70B serial number prefix, manufactured between 1981-1983. This collector’s edition features the distinctive collet bushing design, which was engineered specifically for enhanced accuracy. You can identify these rare specimens by their unique bushing configuration, which Colt later replaced with a solid design.
When you locate one in pristine condition with minimal firing, you’re looking at one of the most valuable 1911 variants.
Conclusion
You’ll find the Colt Series 70 pistol stands like a granite pillar in the 1911 market. Since its 1970 introduction, this variant has maintained Colt’s legacy of precision engineering and reliability. Its simplified firing system, crisp trigger break, and traditional barrel bushing continue to set industry standards. When you’re selecting a Series 70, you’re choosing a time-tested platform that represents the purest form of John Browning’s original design.
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