Suggestions for a build, low low budget

[ironpony52]

At Christmas time RK guns ran a sale on 300BLK Andros complete uppers, $199, I grabbed one. The white box was filthy like it was sitting on the warehouse shelf for years. The same week the LGS ran Anderson complete lowers for $99 grabbed one of those. Joined the upper and the lower now have a 300BLK for $298. I added a Romeo MSR and bipod I had laying around.
a couple of weeks ago they ran the lowers again so I bought another one, these are multi cal lowers. Which caliber would make another good gun. I am thinking 7.62. I am waiting to find another great sale, hopefully.
Definitely a low budget build I am not expecting them to shoot like my SIG AR's but for a few hundred they are hard to beat and if something happens to them no big deal.
This is the 300 done. I am waiting on the paperwork to come back for the suppressor.

 

[tsavo303]

Nothing wrong with that. Enjoy

 

[The ReverendMR]

If it is an AR-15 upper, you’re not going to be able to do 7.62.

 

[Redlion]

If it is an AR-15 upper, you’re not going to be able to do 7.62.

Sure he can. 7.62x39.

 

[Aftermath]

I like the low budget for a dicking around rifle!! Can't beat that!

Low budget sure keeps me on my toes
I count every penny and I watch where it goes
We're all on our uppers, we're all going skint
I used to suck cigars but now I suck polo mints

 

[TonyTheTiger]

Sure he can. 7.62x39.

Or 7.62x35, 7.62x40 etc..

 

[The ReverendMR]

Sure he can. 7.62x39.

My fault. Hadn’t even considered that. Thank you!

 

[Gustav7]

I like the low budget for a dicking around rifle!! Can't beat that!

Low budget sure keeps me on my toes
I count every penny and I watch where it goes
We're all on our uppers, we're all going skint
I used to suck cigars but now I suck polo mints

I always appreciate a good poetic combination of words...

 

[Aftermath]

I always appreciate a good poetic combination of words...

Credit belongs to the Kinks