Here is their tech sheet - https://ty1gp1y141k12fk1dp5xpx1a-wpengine.netdna-ssl.com/wp-content/uploads/2016/11/MPC-12-17-12-MSRP-2.pdf

This rifle's Barrel material: 4150 chrome Moly 1159E vanadium steel - 16" Chrome Lined M4 Barrel - 1:9" twist with 6 grooves and lands.

It is 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps to be exact

MPC carbine with M4A4 type flat-top upper receiver and detachable carry handle. A2 adjustable/fixed square post front sight. Sixteen inch M4 profile chrome-lined barrel with M4 double heat shield handguard with M4 feed ramps, 1:9 inch twist rate and A2 style flash suppressor. Six-position telescoping buttstock. Overall extended length 34.5 inches; collapsed 30 inches.
The team at Windham Weaponry is committed to building the highest quality AR platform firearms, and to providing the absolute best customer service and support that you expect and deserve. Our firearms meet or exceed the most current industry standards.
Windham Weaponry's attention to detail is second to none with our use of the highest quality barrel steel, castings and forgings; extensive quality control program; and our highly experienced employees. Rather than cut corners to save money, we work to improve our rifles to meet or exceed your expectations. --- windhamweaponry.com/firearms/rifles/223-556-caliber-rifle/mpc/

16" Chrome Lined M4 Barrel
1:9" twist with 6 grooves and lands
Yes it has M4 feed ramp