Choosing the right short-barreled rifle (SBR) can be a perplexing endeavor, and the Keltec R57, Smith & Wesson 351 PD, Brownell 180, and B&R BRN 180 are all compelling options in the subcompact platform. Examining their design, performance, and overall utility reveals distinct strengths and weaknesses. The Keltec R57 offers a unique rotating bolt d