Does the PSA Lower 300BO work with the Knights Armament 5.56MM SR-15 KS-1 13.7"?
Lower Receiver
PSA Lower 300BO
from $249.99
Upper Receiver
Knights Armament 5.56MM SR-15 KS-1 13.7" KIT
from $1983.60
Palmetto State Armory lower and upper compatibility
Yes, they fit
The PSA Lower 300BO works with the Knights Armament 5.56MM SR-15 KS-1 13.7" KIT. 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 Palmetto State Armory lower and upper
Backed by tens of thousands of qualified builds that have both a lower and an upper.
Share of builds with the PSA Lower 300BO and any upper
PSA Lower 300BO
- Of lower picks
- 0.2%
- Median paid
- $250
Knights Armament 5.56MM SR-15 KS-1 13.7"
Not in enough builds yet to report.
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 Palmetto State Armory lower and upper
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Bolt Carrier Group
FAXON Firearms 5.56 Nitride TIN PVD
Fits both
Charging Handle
Fits both
Stock & Brace
Suppressor
PSA Lower 300BO vs Knights Armament 5.56MM SR-15: specs and prices
| PSA Lower 300BO | Knights Armament 5.56MM | |
|---|---|---|
| Best price | $249.99 at Palmetto State Armory | $1983.60 at AR15 Discounts |
| Stores | 1 of 1 in stock | 0 of 1 in stock |
| Assembly | Complete | Partial |
| Platform | AR-15 | AR-15 |
| Caliber | 300 Blackout | 5.56 NATO |
| Trigger Pin | .154 | n/a |
| Color | FDE | n/a |
| Length | n/a | 13.7 |
Both for $2233.59 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.
Price history, last 90 days
- PSA Lower 300BO: lowest $237.49 on Jul 12, highest $249.99 on Jul 14 over the last 90 days.
- Knights Armament 5.56MM SR-15 KS-1 13.7": lowest $1983.60 on Jul 11, highest $1983.60 on Jul 11 over the last 90 days.
Upper Receivers frequently paired with the PSA Lower 300BO
Most picked next to it in real builds. Only parts our rules say fit the PSA Lower 300BO are listed.
Lower Receivers most paired with uppers
The Knights Armament 5.56MM SR-15 KS-1 13.7" is not in enough builds yet, so these are the most picked next to any upper. Only parts our rules say fit the Knights Armament 5.56MM SR-15 KS-1 13.7" are listed.
