Description
The Bushmaster XM-15 Complete Lower Receiver (MultiCal Marking), Telestock is the serialized foundation of a modern sporting rifle. This ready-to-assemble component is the legally regulated “firearm” part of an AR-15 build, featuring a 6-position telescoping stock and a lower receiver marked for multiple calibers. It’s the critical first step for building a reliable, customizable rifle, and it ships to Missouri and compliant US states. At $243.45, it provides a solid, factory-assembled starting point for your next project.
Key Features
- Complete & Ready: Arrives fully assembled with trigger group, buffer system, and pistol grip—no gunsmithing required.
- MultiCal Marking: The receiver is stamped for multiple calibers (e.g., 5.56/.223), offering build flexibility for different uppers.
- 6-Position Telestock: A standard, adjustable M4-style stock for proper length-of-pull for different users and gear setups.
- Mil-Spec Compatibility: Built to widely accepted specifications, ensuring reliable fitment with a vast array of AR-15 upper receivers and parts.
- Bushmaster Reliability: Comes from a legacy brand known for producing durable, functional firearms.
Specifications & Details
| Manufacturer | Bushmaster |
| Model | XM-15 Complete Lower |
| Stock Type | 6-Position Telescoping |
| Receiver Marking | Multi-Caliber (e.g., 5.56 / .223) |
| Trigger | Standard Single-Stage |
| Compatibility | Mil-Spec AR-15 Platform |
This lower is the core of your rifle. When it comes to home defense or a day at the range, the reliability starts here. The complete assembly means you can mate it with a compatible upper receiver from brands like Palmetto State Armory, Aero Precision, or BCM, and have a functioning rifle in minutes. The multi-caliber marking isn’t just a formality—it’s your permission slip to build a .300 Blackout upper for suppressed use or stick with the classic 5.56 NATO. The telestock adjusts over an inch and a half of travel, a simple but critical feature for achieving a solid cheek weld whether you’re wearing body armor or a light jacket. The entire unit is built to military blueprint dimensions, which is your assurance that aftermarket grips, triggers, and safety selectors will fit out of the box.
Who It’s For
This lower is for the builder who values a proven, no-fuss starting point. It’s for the Missouri shooter assembling their first AR-15 and wants to avoid the intricacies of installing a trigger or buffer tube. It’s also for the experienced owner looking for a spare, serialized receiver to start a dedicated .22 LR plinker or a precision-oriented build without cannibalizing their primary rifle. If your goal is a functional tool without unnecessary complication, this is your foundation.
Pros & Cons
Pros: Saves significant assembly time and potential frustration. Bushmaster’s factory assembly offers consistent quality control. The multi-cal marking provides legal clarity and build versatility. The mil-spec design guarantees broad parts compatibility. The price point is competitive for a complete, brand-name lower.
Cons: As a complete unit, you’re paying for a standard trigger and grip you might eventually replace. The telestock is basic, not a premium model with enhanced cheek weld or storage. You must conduct an FFL transfer for firearm purchases of this item.
Frequently Asked Questions
Q: What exactly do I need to add to this to have a working rifle?
A: You need a complete upper receiver assembly (barrel, handguard, bolt carrier group, charging handle) and a magazine. Once you pair this lower with a complete upper, they pin together in seconds to form a functioning firearm.
Q: Does “MultiCal Marking” mean I can shoot different calibers without changing anything?
A: No. The marking indicates the lower receiver is designed to safely accommodate uppers in different calibers, like 5.56mm or .300 AAC Blackout. To switch calibers, you must swap the entire upper assembly, ensuring you use the correct magazine for the caliber.
Q: Is the buffer tube compatible with a carbine-length gas system?
A: Yes. The installed buffer tube, spring, and buffer are configured for a carbine-length gas system, which is the standard for the vast majority of AR-15 uppers with 16″ barrels or shorter.
Here’s the thing—building a rifle should be about customization, not troubleshooting basic assembly. This Bushmaster lower removes that hurdle. Start your build on a platform with a proven track record. This complete lower receiver is available at firearms-missouri.com for Missouri residents and nationwide.
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