I think I would stick with stock. If you go trying to upgrade every part of the A-5, it will not be as reliable. That's the only trade-off (besides money) of upgrading. YES I LEARNED THIS THE HARD WAY!!!!!

Edit:
If you can get the howitzer without paying bookoo dollars for it, 75-100 shots sounds good to me!

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Do not merely listen to the word, and so deceive yourselves. Do what it says. -- James 1:22