Compared on builder picks, today's prices and specs.
Our pick: the builders' favorite

Builders pick it 2.3 to 1 over the Rosco Bloodline 16" 556.
$199.73at KY Gun Company, in stock
Builders pick the FN America FN 16 Mid-Length 5.56mm 2.3 to 1 over the Rosco Bloodline 16" 556. It is in 5.4% of GunPartPicker builds that have a barrel, against 2.4% for the Rosco Bloodline 16" 556. It costs $33 more today ($199.73 against $166.50), so the Rosco Bloodline 16" 556 is the value pick if price comes first.
7 stores we track have the FN America FN 16 Mid-Length 5.56mm in stock. Builders paid a median $199.73 for it when they added it, against $152.10 for the Rosco Bloodline 16" 556. On paper they differ on gas system (Mid-Length against Carbine). It is most often built with the Geissele Automatics G2S Two Stage and the Magpul MOE Stock Collapsible.
Builders pick the FN America FN 16 Mid-Length 5.56mm 2.3 to 1.
Shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales. Slot share is the share of builds with a barrel that chose this one. Median paid is the price shown when builders picked it, not today's price; the table below has today's prices.
| Spec | ![]() | ![]() |
|---|---|---|
| Lowest in stock | $199.73KY Gun Company | $166.50Primary Arms |
| Stores in stock | 7 | 1 |
| Caliber | 5.56 NATO | 5.56 NATO |
| Gas System | Mid-Length | Carbine |
| Length | 16 | 16 |
| Twist | 1:7 | 1:7 |
| Contour | M4 | M4 |
| Thread | 1/2x28 | 1/2x28 |
| Actions |
Every store we track for each part, cheapest in stock first. Prices are checked through the day.