Does the LMT Defense Mrp H M Lok 12.5 AR 10 work with the LMT Defense Semi Auto 5.56 NATO?

Upper Receiver
LMT Defense Mrp H M Lok 12.5 AR 10 Stripped
from $1051.99

Bolt Carrier Group
LMT Defense Semi Auto 5.56 NATO
from $242.10
LMT Defense upper and Lewis Machine & Tool bolt carrier group compatibility
Yes, they fit
The LMT Defense Mrp H M Lok 12.5 AR 10 Stripped works with the LMT Defense Semi Auto 5.56 NATO. Our compatibility rules found no conflict between them.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the LMT Defense upper and Lewis Machine & Tool bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the LMT Defense Semi Auto 5.56 NATO and any upper
LMT Defense Mrp H M Lok 12.5 AR 10
- Of upper picks
- 0%
- Median paid
- $1052
LMT Defense Semi Auto 5.56 NATO
- Of bolt carrier group picks
- 0.3%
- Median paid
- $224
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the LMT Defense upper and Lewis Machine & Tool bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
LMT Defense Mrp H M Lok 12.5 vs LMT Defense Semi Auto 5.56: specs and prices
| LMT Defense Mrp H M Lok 12.5 | LMT Defense Semi Auto 5.56 | |
|---|---|---|
| Best price | $1146.60 at BattleHawk Armory | $249.75 at Brownells |
| Stores | 2 of 4 in stock | 2 of 4 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-10 | n/a |
| Receiver Type | AR-10/M5 | n/a |
| Length | 12.5 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Style | n/a | AR-15 Bolt Carrier |
| Weight | n/a | 0.698 |
Both for $1396.35 at today's best prices.
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
LMT Defense Mrp H M Lok 12.5 AR 10 Stripped
Price history, last 90 days
- LMT Defense Mrp H M Lok 12.5 AR 10: lowest $1051.99 on Jul 5, highest $1181.70 on Jul 23 over the last 90 days.
- LMT Defense Semi Auto 5.56 NATO: lowest $224.10 on Jul 6, highest $249.75 on Jul 15 over the last 90 days.
Bolt Carrier Groups most paired with LMT Defense uppers
The LMT Defense Mrp H M Lok 12.5 AR 10 is not in enough builds yet, so these are the most picked next to any LMT Defense upper. Only parts our rules say fit the LMT Defense Mrp H M Lok 12.5 AR 10 are listed.
Upper Receivers frequently paired with the LMT Defense Semi Auto 5.56 NATO
Most picked next to it in real builds. Only parts our rules say fit the LMT Defense Semi Auto 5.56 NATO are listed.













