Bushmaster XM-15 SquareDrop Pistol
- Category
- Pistol
- Barrel
- 229 mm
- Weight, empty
- 2.72 kg
- Introduced
- 2018
About
What it is, and why it matters
The Bushmaster XM-15 SquareDrop is a compact AR pistol chambered in .300 AAC Blackout (also offered in 5.56 NATO) built around Advanced Armament Corporation's SquareDrop modular free-float attachment system. It features a 4150 chrome-moly FNC-treated barrel in 7-, 9-, or 10-inch lengths, an SB Tactical arm brace, an ALG Defense fire control group, an AAC Blackout flash hider, and a Hogue overmolded grip. The SquareDrop rail uses a proprietary geometric attachment pattern for mounting accessories.
The SquareDrop name comes from AAC's squared-off rail attachment lugs, a short-lived alternative to KeyMod and M-LOK; the pistol rode the late-2010s wave of pistol-brace AR builds that exploded in popularity as a workaround to short-barreled-rifle NFA regulations.
MSRP approximately $1,399. A Remington-era Bushmaster product introduced in 2018; offered in .300 Blackout and 5.56 NATO with 7/9/10-inch barrels. Closely related to the Bushmaster XM15-E2S Minimalist-SD. Discontinued following Remington's 2020 bankruptcy.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Bushmaster Firearms International
- Category
- Pistol
- Country
- United States
- Status
- Discontinued
- Produced
- 2018 to 2020
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 229 mm
- Overall length
- 660 mm
- Weight, empty
- 2.72 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated direct impingement
- Firing mechanism
- Hammer fired
- Trigger
- Single stage
- Capacity
- 30
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum alloy
- Barrel
- Chrome moly steel
- Stock
- Polymer
- Finish
- Salt bath nitride
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 600 m/s
- Muzzle energy
- 1400 J
- Effective range
- 200 m
- Maximum range
- 1000 m
Trajectory
What the round does downrange
Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Squaredrop handguard
Free float handguard
Sb tactical arm brace- Pistol arm brace
Alg defense fire control
Aac blackout flash hider
Hogue overmold grip
Fnc treated barrel- Pistol length gas system
Compact design
Threaded barrel
Standing
How it compares
Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.
| Measurement | This firearm | Median | Position |
|---|---|---|---|
| Empty weightAmong 1,909 pistols | 2.72 kg | 794 g | Heavier than about 90% |
| Overall lengthAmong 1,911 pistols | 660 mm | 196 mm | Among the longest tenth |
| Barrel lengthAmong 1,941 pistols | 229 mm | 102 mm | Longer than about 90% |
| Magazine capacityAmong 1,962 pistols | 30 | 8 | Holds more rounds than about 90% |
Answers
Questions about the Bushmaster XM-15 SquareDrop Pistol
How much does the Bushmaster XM-15 SquareDrop Pistol weigh?
The Bushmaster XM-15 SquareDrop Pistol weighs 2.72 kg (6.00 lb) empty.
What caliber is the Bushmaster XM-15 SquareDrop Pistol?
The Bushmaster XM-15 SquareDrop Pistol is chambered in .300 AAC Blackout and 5.56x45mm NATO.
How many rounds does the Bushmaster XM-15 SquareDrop Pistol hold?
The Bushmaster XM-15 SquareDrop Pistol holds 30 rounds, fed from a detachable box magazine.
How long is the Bushmaster XM-15 SquareDrop Pistol?
The Bushmaster XM-15 SquareDrop Pistol is 660 mm (26.0 in) long overall, with a 229 mm (9.02 in) barrel.
Who makes the Bushmaster XM-15 SquareDrop Pistol?
The Bushmaster XM-15 SquareDrop Pistol is made by Bushmaster Firearms International (United States).
When was the Bushmaster XM-15 SquareDrop Pistol introduced?
The Bushmaster XM-15 SquareDrop Pistol was introduced in 2018 and discontinued in 2020.
How does the Bushmaster XM-15 SquareDrop Pistol operate?
The Bushmaster XM-15 SquareDrop Pistol uses a gas operated direct impingement action, and its firing mechanism is hammer fired.
Compatibility
Which parts fit this firearm
Studio
Every part that mounts on this, resolved
Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.
- Every part that mounts on any firearm in the catalogue
- Interface standards, platforms and fit overrides
- The same answers through the API and the MCP server
Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.
Provenance
What the record holds
Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.
Provenance
Confidence in this record
68%
Stockists
Where to buy
Offers link straight to the shop. GunSpec never takes the order.
No shop has listed this firearm yet
Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.
List a firearmMCP
Ask an assistant about it
The same record, reached the way a person asks for it rather than the way a program does.
Ask GunSpec
Works with
Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/firearms/bushmaster-xm15-squaredrop' \ --header 'X-API-Key: your_key'{ "id": "bushmaster-xm15-squaredrop", "name": "Bushmaster XM-15 SquareDrop Pistol", "manufacturer": { "id": "bushmaster", "name": "Bushmaster Firearms International", "countryCode": "US", "foundedYear": 1973, "website": "https://www.bushmaster.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:43:43", "version": "03ce3f7c1eccaa2ca96d02509bf7ac8fd765e20d3dc759b45ee02f86a4c6348e" }, "category": { "id": "pistol", "name": "Pistol", "description": "Handguns designed to be fired with one or two hands" }, "country_of_origin": "US", "year_introduced": 2018, "barrel_length_mm": 229, "weight_empty_g": 2722, "action_type": "gas_operated_direct_impingement"}