Just picked up the Mantis X10 Elite to help with the lack of ammo, and the cost of ammo. Seems like so far, it's a great option for practice, as it will provide feedback.
...
https://www.youtube.com/watch?v=m0d9QAMCjO4
A slow build just to see how cheap I could go.
PSA BCG - $49.99
LuterAR Gas block - $17.81
Anderson Charging Handle - $8.99
Gas Tube - $8.95
Anderson Upper $28.99
PSA Ejection Cover Assembly - $5.99
PSA Forward Assist Assembly - $12.95
CMT Handguard (used) - $60
BCA Barrel - $0.00
...
https://www.youtube.com/watch?v=5LLYpUwyfwI
Have seen people complaining about the recoil of an AK-47 pattern rifle after shooting an AR-15 pattern rifle. This is just silly.
...
https://www.youtube.com/watch?v=O4qQMlWVLI8