Does the Battle Arms Development Workhorse work with the Rosco Manufacturing K9 5.56 NATO Sage?

Lower Receiver
Battle Arms Development Workhorse Stripped 5.56 NATO / .223
from $125.00

Barrel
Rosco Manufacturing K9 5.56 NATO Sage Dynamics Patrol Length
from $144.00
Battle Arms Development lower and Rosco Manufacturing barrel compatibility
Yes, they fit
The Battle Arms Development Workhorse Stripped 5.56 works with the Rosco Manufacturing K9 5.56 NATO Sage Dynamics. Our compatibility rules found no conflict between them.
This exact setup is in a real GunPartPicker build.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
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 Battle Arms Development lower and Rosco Manufacturing barrel
Backed by thousands of qualified builds that have both a lower and a barrel.
Share of builds with the Battle Arms Development Workhorse and any barrel
- This pairRosco Manufacturing K9 5.56 NATO Sage Dynamics20%
Share of builds with the Rosco Manufacturing K9 5.56 NATO Sage and any lower
- This pairBattle Arms Development Workhorse Stripped 5.5614%
Battle Arms Development Workhorse
- Of lower picks
- 0%
- Median paid
- $125
Rosco Manufacturing K9 5.56 NATO Sage
- Of barrel picks
- 0.2%
- Median paid
- $152
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 Battle Arms Development lower and Rosco Manufacturing barrel
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Upper Receiver
Handguard

Midwest Industries G4 10.5" M-LOK
Fits both
Charging Handle
Bolt Carrier Group
Gas Block
Pistol Grip
Buffer Tube Assembly
Battle Arms Development vs Rosco Manufacturing K9 5.56: specs and prices
| Battle Arms Development | Rosco Manufacturing K9 5.56 | |
|---|---|---|
| Best price | $125.00 at BattleHawk Armory | $171.00 at AT3 Tactical |
| Stores | 3 of 4 in stock | 2 of 8 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Caliber | 5.56 NATO | 5.56 NATO |
| Trigger Pin | .154 | n/a |
| Finish | Hardcoat Anodized | n/a |
| Color | Black | n/a |
| Gas System | n/a | Carbine |
| Length | n/a | 11.5 |
| Twist | n/a | 1:7 |
| Contour | n/a | Enhanced Taper |
| Thread | n/a | 1/2x28 |
| Weight | n/a | 27.05 |
Both for $296.00 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.
Battle Arms Development Workhorse Stripped 5.56
Price history, last 90 days
- Battle Arms Development Workhorse: lowest $119.11 on Jul 22, highest $131.95 on Jul 31 over the last 90 days.
- Rosco Manufacturing K9 5.56 NATO Sage: lowest $149.49 on Aug 31, highest $184.99 on Aug 9 over the last 90 days.
Barrels frequently paired with the Battle Arms Development Workhorse
Most picked next to it in real builds. Only parts our rules say fit the Battle Arms Development Workhorse are listed.
Lower Receivers frequently paired with the Rosco Manufacturing K9 5.56 NATO Sage
Most picked next to it in real builds. Only parts our rules say fit the Rosco Manufacturing K9 5.56 NATO Sage are listed.

















