PSA 5.56 Phosphate MPI Full-Auto Bolt Carrier Group
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Palmetto State Armory
Overview
The PSA 5.56 Phosphate MPI Full-Auto Bolt Carrier Group is designed for reliable performance in 5.56 NATO chambered rifles. The phosphate finish offers a level of corrosion resistance while maintaining a rugged, no-nonsense appearance. This bolt carrier group is commonly found in builds focused on durability and consistent functionality, making it a solid choice for both tactical and recreational shooting applications.
Specifications
PSA 5.56 Phosphate MPI Full-Auto Bolt Carrier Group
Build history on GunPartPicker
Builders have been adding the PSA 5.56 Phosphate MPI Full-Auto Bolt Carrier Group to their builds on GunPartPicker since March 2026. All time, it ranks #154 of the 445 bolt carrier groups builders have added. Builds with this bolt carrier group are nearly all chambered in 5.56 NATO, nearly all on carbine-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today the one retailer we track has it in stock. Prices barely moved in August 2026, holding around $99.99, so there haven't been real sales lately. Buying today, the lowest price is $99.99 at Palmetto State Armory, which matches the best price we saw in August.
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Frequently Built With
The part most often added in each category by the 11 builds that include this one
Wilson Combat AR-15 Billet Upper Receiver
Smith & Wesson Sw M&P15 Stripped Lower Receiver 5.56mm
PSA AR-15 Charging Handle 7075 T6 Forged Mil-Spec - 24080
James Madison Tactical Black Ops Single Stage Drop in AR-15 Trigger - Straight
Magpul AFG-2 Angled Fore Grip - Black
CMMG AR-15 Carbine Action Buffer Spring - 55CA9A2
Builds Featuring This Part
See all 2 →Builds in the community that include the PSA 5.56 Phosphate MPI Full-Auto Bolt Carrier Group
| Build | Parts | Total |
|---|---|---|
 | 10 | $936.46 |
 | 26 | $1588.77 |
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