AR-15 Forward Assist Assembly | Complete Kit for Mil-Spec Uppers | SKU/UPC 859819007874

Restore positive bolt closure and duty-grade reliability with the AR-15 Forward Assist Assembly (SKU/UPC 859819007874). Whether you’re completing a new build or refreshing a hard-use carbine, this complete kit gives you the forward assist plunger, spring, and roll pin you need to ensure manual bolt drive in gritty, cold, or high-round-count conditions. Designed for mil-spec upper receivers with the forward-assist boss, it’s a simple, proven upgrade that pays off when the environment gets ugly.

Why Add a Forward Assist?

• Positive bolt closure: Manually drive the bolt carrier into battery if fouling, debris, or cold causes sluggish closing.

• Immediate action aid: Quietly nudge the carrier forward when stealth matters—no need to run the charging handle again.

• Field reliability: Extra margin for suppressed, dirty, or over-the-beach conditions where carbon and grime build up fast.

• OEM-style fit: Compatible with most M4/M16 pattern uppers cut for a forward assist.

What’s Included

• Forward assist plunger (textured pawl head for positive press)

• Forward assist spring (optimized tension)

• Roll pin (to secure the assembly in the receiver)

Note: This kit installs into a forward-assist cut upper receiver. It will not retrofit slick-side or forward-assist-delete uppers.

Compatibility

• Platforms: AR-15/M4 pattern uppers that include a forward-assist boss

• Carriers: Works with standard AR-15 bolt carrier groups featuring the forward-assist serrations

• Finish: Typically manganese phosphate or nitride (varies by lot); compatible with anodized receivers

Installation (Quick Guide)

1. Verify clear & safe. Separate upper/lower and remove the BCG and charging handle.

2. Align components. Insert the spring onto the plunger, then slide the assembly into the forward-assist channel with the pawl oriented toward the carrier serrations.

3. Pin in place. Align the roll-pin hole and drive the roll pin from the rear forward using a roll-pin starter and punch.

4. Function check. Reinstall BCG/charging handle. Press the forward assist—ensure the pawl engages the carrier serrations and returns under spring tension.

Pro Tips

• Use masking tape around the boss to protect finish during pin driving.

• If your carrier lacks serrations (rare on some lightweight carriers), the forward assist will not engage—verify before install.

• Lightly oil the plunger and channel; avoid heavy grease that collects grit.

Troubleshooting

• No engagement: Check pawl orientation and confirm your BCG has forward-assist serrations.

• Sticky return: Clean the channel and plunger; inspect for burrs; re-oil lightly.

• Roll pin walk-out: Replace a distorted pin and re-seat with proper support; verify alignment.

Ideal Use Cases

• Duty/defense rifles where redundancy matters

• Suppressor hosts that run dirtier under backpressure

• Training/range guns in dusty or sandy environments

• Cold-weather rifles where sluggish cycling is more likely

Key Features at a Glance

• Complete forward assist kit (plunger, spring, roll pin)

• Mil-spec pattern for AR-15/M4 receivers with FA boss

• Positive, tactile engagement to seat the bolt quietly and decisively

• Easy drop-in install with common armorer tools

• SKU/UPC: 859819007874

Specifications

Care & Maintenance

• Keep the plunger channel clean; a few drops of light oil ensure smooth return.

• Inspect the roll pin and plunger head during routine cleanings—replace if peened or excessively worn.

• After extreme dust, mud, or rain exposure, remove the BCG and flush the FA channel with solvent, then re-lubricate lightly.

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**Add reliability where it counts—the AR-15 Forward Assist Assembly (859819007874) delivers decisive, quiet bolt seating for hard-use carbines and precision builds alike.
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