Samson FS-004 Field Survivor A2 Tool for Stag / CMMG Piston Units
The Samson FS-004 Field Survivor A2 Tool is a compact, grip-stored field kit designed for Stag and CMMG piston systems. Featuring a dedicated piston adjustment wrench and 14 essential tools, including a broken shell extractor, front sight adjustment tool, bore brush with pull-through cable, oil ampule, and magazine gauges, it keeps your rifle in peak condition anywhere. Compatible with standard A2, Hogue, Ergo 2 AR, and Ergo Tactical Deluxe grips, it delivers tactical versatility and reliable maintenance in one discreet, easy-to-carry unit.
The Samson Field Survivor FS-004 is a compact, all-in-one tactical field tool designed specifically for the Stag Model 8 piston system and compatible CMMG variants. Maintaining the same sleek form factor as the original Field Survivor, it fits neatly inside standard A2, Hogue, Ergo 2 AR, and Ergo Tactical Deluxe pistol grips, keeping essential tools at your fingertips without adding bulk.
Purpose-built for reliability in the field, the FS-004 includes a dedicated piston adjustment wrench for Stag and CMMG piston systems, along with 14 essential tools to keep your rifle mission-ready:
- Go / No-Go magazine gauge
- Flathead screwdriver
- Cotter pin hook
- Piston adjustment wrench
- Oil ampule (empty, for one field lube)
- Front sight adjustment tool
- Magazine feed lip adjustment tool
- Broken shell extractor
- Extractor pin storage
- Magazine curvature gauge
- Bore brush
- Pull-through cable
- Two spare cotter pins
- 1/2" nut wrench
- Samson FS-004 Field Survivor A2 Tool for Stag / CMMG Piston Units
Tactical Scope Shipping Policy
Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.
Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.
DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY – READ MORE: HERE
Note: The above DPD link is to our group partner site Optics Warehouse, with whom we share logistics and stock. Link opens in a new window.
Couriers
We use DPD, Royal Mail, TNT, and UPS courier services for all our UK and international orders. Once your order is dispatched, you will receive an email with your unique tracking number.
In-Store Items
These are items we have in stock and aim to dispatch within 1–2 working days. During busy periods, this may be delayed slightly. If you'd prefer to collect your item in person, please contact us in advance to arrange. Collection orders must be paid for beforehand.
Pre-Order Items
Pre-order items are typically out-of-stock or in limited supply. Purchasing a pre-order secures your item, and it will be dispatched within 24 hours of restock where possible. Check the product page for estimated restock dates. These dates may change, so staying in touch is advised.
International Delivery & Taxes
If your shipping address is outside the UK, you may incur import duties or taxes upon arrival in your country. These charges are your responsibility. Customs regulations vary, so please check with your local customs office. Some packages may be opened for inspection.
Need Help?
If you need assistance, call us at +44 (0)1803 611895 (Optics Warehouse) or email [email protected].
DPD Shipments & PIN Code Delivery
We have now introduced DPD Pin Code verification for all orders shipped via DPD. You will receive a PIN via email and text.
A valid email and mobile number must be provided at checkout. Emails will come from Riviera House 3PL. Please check spam/junk folders if not received.
Failure to present your PIN to the delivery driver will result in a failed delivery and rescheduling may be required.