Sprinco M4 Extra Power Buffer Spring (Red)

Purchased for LWRC M6A2 DEA and ARC-Fire Trigger.

Specs from sprinco.com 2026

• ASTM Grade A877 Certified Valve Quality Chrome silicon Wirestock
• Heat Treated, Stress Relieved and Dual Stage Shot-Peened post winding (Our springs really ARE shot-peened)
• Impregnation / Plating with Re-Micronized Molybdenum Disulfide formulation

Overview from sprinco.com 2026

RED SPRING

Part No. 25004
Tactical Springs LLC M4 / CAR-15 EXTRA POWER Moly-Plated Chrome Silicon CARBINE Buffer Spring in Hard Tube (Color Coded RED)

Extra Power Buffer Spring. This was our first AR buffer spring solution that we were tasked to design back in 2006 for a Force Modernization Team to specifically address spring-related M4 carbine reliability function issues for operating challenges in the Eastern Asia Theatre. The design loads of the Red spring are approximately 25% greater than the White spring for one of the considered Load Constants in the spring design. Refer to provided tuning procedure reference documents prior to calling for recommendations for use. The Red spring is commonly used in 9mm, 6.8 SPC, 6.5 Grendel, .450 BM, .450 SOCOM, .500 Beowulf, and Colt LE6920's specimen carbines, but certain specimen guns can deviate from the norm depending upon port values and the power factor of your chosen ammunition loads. Color Coded RED.

NOTES: The RED spring is appropriate for moderately gassed .308 / 6.5 CM / .260 Rem heavier caliber carbine platforms using AR-10 / SR-25 Pattern (Armalite, LMT, LaRue, KA.C, etc. receiver extensions and 3.25" carbine buffers. NOT for use in "DPMS Pattern".308 Carbines using standard 7" deep M4 extension tubes and short, 2.5" buffers. (Use our "ORANGE" Spring" for that specific platform approach application.)

• Increased "lock time" for faster sight recovery and platform stability
• Consistent spring pressure throughout the duty cycle of the spring, resulting in fewer malfunctions related to spring operation (Especially Type III malfunctions)
• Improved & consistent cyclic operation. Spring will not change performance for many hundreds of thousands of rounds
• Greater resistance to heat induced performance degradation
• Reduced cyclic rate with Enhanced or Extra Power springs and reduce / eliminate bolt bounce with optimal spring / buffer weight selection
• Reduced operating cost as replacement springs are not needed during the life of your upper receiver assembly. Less downtime and fewer trips to the armorer for spring replacement, in fact, this will most likely be the only buffer spring you will ever need for the duty cycle of your carbine or rifle!

Markings

Tube Label	M4 / CAR-15 EXTRA POWER BUFFER SPRING
	CHROME SILICON MOLY-PLATED
	657780250042

Receipts

Receipt (OpticsPlanet): <redacted>

OpticsPlanet (opticsplanet.com) April 7th 2026 Order # 30632961
Product	SKU	Qty	Price	Total
Magpul AFG2 Angled Foregrip, Black, MAG414BLK	55-WG1-MAG414-MAG414BLK	1	$31.95	$31.95
Bravo Company MFG Vertical Grip Mod 3 Fits Picatinny Rails, Black	BCM-VG-VG1913MOD3BLK-BCMVG1913MOD3BLK	1	$20.95	$20.95
Sprinco USA Sprinco AR15 Carbine Extra Power Buffer Spring, Red, SPRINCO-25004	6Q8-BUS-BCNN13-SPRINCO-25004	1	$19.95	$19.95
Subtotal				$72.85
Coupon				-$6.35
Shipping				$0.00
Tax				$5.49
Total				$71.99