Group JPBC-4ba Low-Mass Bolt/Carrier
$460.75 at OpticsPlanet · 2 stores
In stock Sale
Best price
$460.75at OpticsPlanet
In stock Sale checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $460.75Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| Rainier Arms | $437.90not checked recently | Check store | Buy at Rainier Arms |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $460.75 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $460.75 | $460.75 | $460.75 |
Since Sep 28, 2026.
About this part
The JP Enterprises Ultra Low Mass Operating System is a bolt carrier group from JP Enterprises. It's sold by 2 stores (1 in stock), from $437.90 to $460.75. The lowest in-stock price in the last 30 days was $460.75 at OpticsPlanet.
Specifications
- Manufacturer
- JP Enterprises
From the manufacturer
While use of the LMOS™ components is recommended only for competition and sporting use, this is only precautionary as their reliability is excellent, particularly on rifles with adjustable gas systems. Like all our bolt carrier designs, LMOS™ carriers feature a 100% increase in bearing surface for smoother operation, improved alignment and lower wear in the upper receiver as well as the longer Mil-spec. cocking pad for optimal reliability. In fact, Team JP shooters have been using the LMOS™ system for over a decade without any reported operating system malfunctions at a match, and most every shooter that implements this operating system feel that it is proven to be a great performance improvement. Some shooters have even reported fewer unexplained flyers in their groups after switching to the LMOS™ system.
For small-frame rifles, the complete JP LMOS™ system consists of one of our low mass bolt carriers and our lightweight buffer conversion kit, but any LMOS™ component can be installed individually in your existing setup and run smoothly.
JP LMOS™ Bolt Carrier Group with JP EnhancedBolt™
Small-Frame
7075 T6 Aluminum
Anodized
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