Your Browser is OutdatedAR15 Lower Parts from Top Brands like Geissele, Aero Precision, JP Enterprises & More — 1,805 products / 3,700 models — Page 1
Shop online for great deals on AR15 Lower Parts kits and lower receiver parts. Whether you’re looking for buffer tubes, enhanced AR 15 lower parts kits, replacement parts like takedown pins, a new trigger assembly, an ambidextrous safety selector, or lower receiver parts kits that have everything you need for a complete build kit, you’ve come to the right place! Save big today on all of the AR15 parts and gun parts you need to upgrade or complete your build.
What Are the Parts of the AR15 Lower Receiver?
Not counting the various springs, the basic parts of an AR15 lower receiver are:
- Trigger Assembly
- Trigger guard
- Magazine catch/release
- Bolt catch/release
- Safety selector switch
- AR 15 Pistol grip
- Takedown pins
- Buffer tube
- Buffer & spring
- Buttstock (or optional wrist brace on AR pistols)
How Many Pins Does an AR15 Lower Receiver Have?
A lower receiver typically has the following six pins:
- Bolt catch roll pin
- Hammer pin
- Pivot pin
- Takedown pin
- Trigger guard roll pin
- Trigger pin
Are All AR15 Lower Parts the Same?
While AR 15 lower parts are generally standardized to fit within a typical AR15 lower receiver, there are some differences and variations to consider:
- Mil-Spec vs. Commercial Spec: Most AR15 Lower Parts kits (LPKs) are designed to be Mil-Spec, meaning they conform to military specifications for compatibility and interchangeability. However, there are also commercial-spec parts that might have slight differences in dimensions and quality.
- Quality and Materials: Lower parts can vary in terms of the materials used and the manufacturing process. For instance, parts can be made from different grades of steel or aluminum, and some may be coated or treated to enhance durability and performance.
- Enhanced Parts: Many manufacturers offer enhanced or upgraded lower parts, such as improved triggers, ambidextrous controls, and anti-walk pins. These parts can improve the performance and usability of the rifle but may have different dimensions or installation requirements.
- Compatibility: While most AR15 lower parts are interchangeable among AR15 platforms, some proprietary designs by certain manufacturers may not be compatible with standard AR15 lowers. It's important to ensure compatibility, especially if you're mixing parts from different manufacturers.
- Caliber Variations: Though AR15s are most commonly chambered in .223/5.56, they can also be built for other calibers like .300 Blackout, 6.5 Grendel, or 9mm. Some lower parts may be specific to certain calibers, especially those related to the magazine catch and bolt catch mechanisms.
Buy AR 15 Lower Parts Kits & Lower Receiver Parts at OpticsPlanet!
Get all of your AR 15 Lower Parts Kits and Lower Receiver Parts right here at OpticsPlanet! Check out the list below to see just a handful of the most popular top brands we carry!
- Aero Precision AR-15 Lower Parts Kits
- Strike Industries AR15 Lower Parts Kits
- CMMG, Inc. AR15 Lower Parts Kits
- Armaspec AR15 Lower Parts Kits
- RISE Armament AR15 Lower Parts Kits
- ODIN Works AR15 Lower Parts Kits
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