Some of the best guns I built that were powerful were the Knexsayer, ZKAR, TR, and NAR. I liked the knexsayer the best because it was pump action and you could easily convert it into a shotgun.
Depends what you mean by "good" and "pretty powerful". I'm sure most people are going to instantly jump to the NAR and TR18. They're powerful, yes, but rather dull in my opinion. There are quite a few good guns but seeing how I'm sure most other people are going to advertise their own guns, I'll just say that I recommend the Oodassault 3.6 of mine if you want something with decent power, easy loading, and an overall cool design. Otherwise just wait for other replies
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OSNJCKMA2
I'm sure most people are going to instantly jump to the NAR and TR18. They're powerful, yes, but rather dull in my opinion. There are quite a few good guns but seeing how I'm sure most other people are going to advertise their own guns, I'll just say that I recommend the Oodassault 3.6 of mine if you want something with decent power, easy loading, and an overall cool design.
Otherwise just wait for other replies