AR-15 Ultra Duty Lower Parts Kit DDC
$131.04 at Kentucky Gun Co · 7 stores
In stock
Best price
$134.49at Brownells
Out of stock checked Oct 21, 2026
In stock now instead
- AR-15 Ultra Duty Lower Parts Kit DDC $131.04at Kentucky Gun Co
- MCR Magazine Adapter $130.99at Ammunition Depot
- FightLite AR15/M16/M4 MCR Magazine Adapter Black $130.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $134.49checked Oct 21, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar lower parts in stock
This part is out of stock at every store we track. These similar lower parts are in stock, with today's prices.
MCR Magazine Adapter
$130.99 at Ammunition Depot · 5 stores
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FightLite AR15/M16/M4 MCR Magazine Adapter Black
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Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $134.49 | $134.49 | $134.49 |
Since Sep 28, 2026.
About this part
The Hammer With Strut, Hk33/53, 5.56mm is an AR-15 lower part from Heckler & Koch. One store lists it, Brownells at $134.49.
Specifications
- Manufacturer
- Heckler & Koch
- Platform
- AR-15
From the manufacturer
HK33 HAMMER WITH STRUT, HK33/53, 5.56MM Mfg: Heckler & Koch
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