RSASS
- Category
- Sniper Rifle
- Barrel
- 558 mm
- Weight, empty
- 5.20 kg
- Introduced
- 2009
About
What it is, and why it matters
The Remington Semi-Automatic Sniper System (RSASS) is a precision semi-automatic rifle developed by Remington Defense for military special operations and law enforcement applications. Built on an AR-10-type platform with a direct impingement gas system, the RSASS features a 558mm (22-inch) match-grade stainless steel barrel and a Geissele two-stage match trigger, delivering sub-MOA accuracy from a semi-automatic platform. The rifle was developed in collaboration with US Naval Special Warfare operators who provided input on ergonomics, weight distribution, and operational requirements. The RSASS uses a free-floating handguard with full-length Picatinny rails, accepts standard SR-25/M110 pattern magazines, and features an adjustable Magpul PRS stock. The rifle represents Remington Defense's entry into the precision semi-automatic market, competing directly with the Knight's Armament SR-25/M110 and the HK417 platform.
The RSASS was born from direct collaboration between Remington Defense engineers and Navy SEAL snipers who wanted a lighter, more accurate alternative to the Knight's Armament M110. Despite its technical merits, the RSASS ultimately lost the CSASS competition to the HK G28E (M110A1), though it found a dedicated following among special operations units and federal agencies who appreciated its match-grade accuracy and refined ergonomics.
The RSASS was developed with significant input from Navy SEAL snipers and was initially designed to compete for the US military's Compact Semi-Automatic Sniper System (CSASS) program. The rifle uses a JP Enterprises silent captured spring buffer system to reduce felt recoil and bolt carrier velocity. The match-grade barrel is manufactured from 416R stainless steel with 5R rifling, which features five grooves with a shallower land-to-groove transition for reduced bullet deformation and easier cleaning. Production ended when Remington Arms filed for bankruptcy in 2020. The RSASS achieved limited but notable adoption among US special operations forces and federal law enforcement agencies.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- Remington Arms
- Category
- Sniper Rifle
- Country
- United States
- Status
- Discontinued
- Produced
- 2009 to 2020
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 558 mm
- Overall length
- 1067 mm
- Weight, empty
- 5.20 kg
- Weight, loaded
- 5.80 kg
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Gas operated direct impingement
- Firing mechanism
- Hammer fired
- Trigger
- Two stage
- Trigger pull
- 20.0 N
- Capacity
- 20
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Aluminum alloy
- Barrel
- Match grade stainless steel
- Stock
- Polymer composite
- Finish
- Matte black
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 840 m/s
- Muzzle energy
- 3353 J
- Effective range
- 800 m
- Maximum range
- 2800 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.
Free floating barrel
Match grade barrel
Adjustable buttstock
Accessory rail
Quad rail handguard
Match grade trigger
Suppressor ready
Flash hider
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 80 7.62x51mm NATO sniper rifles | 5.20 kg | 5.04 kg | Near the median |
| Overall lengthAmong 80 7.62x51mm NATO sniper rifles | 1067 mm | 1116 mm | Shorter than about 60% |
| Barrel lengthAmong 80 7.62x51mm NATO sniper rifles | 558 mm | 559 mm | Near the median |
| Magazine capacityAmong 80 7.62x51mm NATO sniper rifles | 20 | 15 | Holds more rounds than about 80% |
Answers
Questions about the RSASS
How much does the RSASS weigh?
The RSASS weighs 5.20 kg (11.46 lb) empty and 5.80 kg (12.79 lb) loaded.
What caliber is the RSASS?
The RSASS is chambered in 7.62x51mm NATO.
How many rounds does the RSASS hold?
The RSASS holds 20 rounds, fed from a detachable box magazine.
How long is the RSASS?
The RSASS is 1067 mm (42.0 in) long overall, with a 558 mm (22.0 in) barrel.
Who makes the RSASS?
The RSASS is made by Remington Arms (United States).
When was the RSASS introduced?
The RSASS was introduced in 2009 and discontinued in 2020.
How does the RSASS operate?
The RSASS 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.
In service
- United States Naval Special Warfare (Navy SEALs)
- United States
- United States Secret Service
- United States
- FBI Hostage Rescue Team
- United States
- US Customs and Border Protection
- United States
Provenance
Confidence in this record
72%
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/rsass' \ --header 'X-API-Key: your_key'{ "id": "rsass", "name": "RSASS", "manufacturer": { "id": "remington", "name": "Remington Arms", "countryCode": "US", "foundedYear": 1816, "website": "https://www.remarms.com", "logoUrl": null, "description": null, "status": "active", "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:38", "updatedAt": "2026-02-18 03:40:45", "version": "f839df62af811e3e261014e3302be8a7e112b5d78fb2f9f7bfad68d74817c9c8" }, "category": { "id": "sniper-rifle", "name": "Sniper Rifle", "description": "Precision rifles optimized for long-range accuracy" }, "country_of_origin": "US", "year_introduced": 2009, "barrel_length_mm": 558, "weight_empty_g": 5200, "action_type": "gas_operated_direct_impingement"}