Improvised revolvers seized in South America Posted September 23, 2014 in Guns & Gear, News, Pistols by ImproGuns with 11 CommentsTags: brazil, gun control, homebuilt revolvers, homemade firearms, improguns, improvised firearms, zip guns I thought some of these examples were particularly … rustic. The last example appears to be trying to channel a S&W Model 3 top-break.