Advice on WRA Trench Gun

[HoosierNative]

Looking at purchasing the following trench gun. I know little about these and would appreciate any advice and any additional questions to ask before committing. Thanks in advance.

http://shop.pre98.com/category.sc;jsessionid=37390EF233849062E5933715E20 8F502.qscstrfrnt04?categoryId=35

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