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FN 15 SRP G2 5.56 NATO
5.56 NATO • FN America

FN 15 SRP G2 5.56 NATO

Model: 36-100558

30
CAPACITY
16.0"
BARREL
6.3
LBS
Semi-Auto
ACTION
5.56 NATO
CALIBER
$1,529
MSRP

Full Specifications

Series SRP G2
Action Type Semi-Auto
Trigger Mil-Spec Single Stage
Trigger Pull 6.3 lbs
Safety Mil-Spec Safety Selector
Optic Ready Yes
Magazines Included 1
Overall Length 35.2"
Barrel Length 16.0"
Height 10.25"
Width 2.75"
Weight 100.0 oz (6.25 lbs)
Frame Material Aluminum
Receiver Material Hard-Anodized Aluminum
Receiver Finish Manganese Phosphate
Barrel Material Alloy Steel
Barrel Finish Manganese Phosphate
Twist Rate 1:7"
Thread Pattern 1/2x28
Muzzle Device A2 Compensator
Stock Material Polymer
Grip Type A2 Pistol Grip
Country of Origin USA

About This Firearm

FN America designed the SRP G2 as a patrol-ready carbine, and the feature list reads like a department armorer's wish list. The 16-inch alloy steel barrel gets a manganese phosphate finish instead of the nitride treatment on the cheaper Guardian, and folding metal front and rear sights come installed from the factory. The A2 compensator directs gas and muzzle blast upward, which reduces muzzle rise during rapid fire but does add flash signature compared to a flash hider.

At 100 oz (6.25 lbs), the SRP G2 sits between FN's own Guardian at 105.6 oz and the TAC3 at 112 oz. The 6.3 lb mil-spec single-stage trigger is on the heavier side of standard, which is typical for a duty-oriented rifle where a light pull is a liability. The hard-anodized aluminum receivers and manganese phosphate finish match the corrosion resistance profile that law enforcement agencies look for in a patrol gun that rides in a vehicle rack.

If you plan to mount an optic, check your mounting footprint against the Picatinny top rail before buying. The folding front sight sits on the gas block and will co-witness with most red dots at lower-third height, but taller magnified optic mounts may require removing the rear sight to clear the eyepiece. Budget for a rear BUIS with a quick-detach mount if you want both an LPVO and backup irons.

Best For

GOOD
Duty / Patrol
Factory folding metal sights, a 6.3 lb trigger pull, and manganese phosphate corrosion resistance all point toward duty use. The 6-position stock adjusts for different body armor configurations. The A2 compensator controls muzzle rise during controlled pairs. At 100 oz, it rides in a vehicle rack or carries on a sling through a shift without excessive fatigue.
GOOD
Home Defense
Ships ready to use with iron sights, so there is no delay waiting for an optic to arrive. The 35.2-inch overall length is compact enough for hallways. The 1:7 twist handles 55gr defensive loads and heavier 62gr barrier-blind ammunition equally well. M-LOK slots along the handguard make adding a weapon light straightforward.
FAIR
Range / Training
The 6.3 lb trigger pull is adequate for fundamentals work but lacks the crispness that makes long range sessions comfortable. The A2 grip is functional but not ergonomic during extended shooting. Good for maintaining duty proficiency, less ideal as a dedicated range toy where trigger feel matters most.

Strengths & Limitations

Strengths
  • Ships with folding metal front and rear sights installed, making it functional straight out of the box without additional purchases
  • Manganese phosphate finish on both the barrel and receivers provides strong corrosion resistance for duty use and vehicle storage
Limitations
  • The 6.3 lb mil-spec trigger pull feels heavy for range work, and most owners report replacing it within the first year
  • The A2 pistol grip is a basic mil-spec design that lacks the palm swell and texture of aftermarket options like the BCM Mod 3 found on competing rifles
  • The A2 compensator reduces muzzle rise but increases flash and side blast, which is a poor tradeoff for low-light home defense situations

Category Rankings

How the FN 15 SRP G2 5.56 NATO ranks among full-size 5.56 NATO rifles.

Capacity
#3 of 25
Top 12%
30 rds
Weight
#5 of 25
Top 20%
6.3 lbs
Barrel
#8 of 25
Top 32%
16.0"
Trigger Pull
#4 of 5
Top 80%
6.3 lbs
MSRP
#17 of 25
Top 68%
$1529
Overall Length
#5 of 25
Top 20%
35.2"

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Where to Buy

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Frequently Asked Questions

Will a red dot co-witness with the factory iron sights?

Yes, most standard-height red dots (like the Aimpoint PRO or Sig Romeo 5) will co-witness at lower-third height with the folding front sight. The rear sight folds flat and clears the optic window. If you mount a magnified LPVO, check that the rear eyepiece bell clears the folded rear sight, as some 1-6x scopes on lower mounts can contact it.

What changed from the original SRP to the SRP G2?

The G2 revision updated the handguard to an M-LOK free-float design, replacing the older drop-in handguard with a fixed front sight base. FN also revised the upper receiver to accept the new rail system and updated the stock to a 6-position collapsible design. The barrel profile and metallurgy stayed the same between generations.