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RDB步枪是Kel-Tec公司继RFB步枪之后推出的又一款无托式步枪,尽管二者外形有些相似,但是结构却差别很大。RFB步枪采用的是前抛壳方式,结构相对复杂,RDB步枪采用的则是下抛壳方式,结构相对简单,两者均适合左右手操作。RDB步枪名称中的D即表示下抛壳,其抛壳窗位于弹匣后方,枪机运动到弹匣后方才进行抛壳,枪机行程变长,全枪长度也相对增加。这种抛壳方式对于立姿射击基本没有影响,面对于卧姿射击来说,会很容易烫伤手臂,这种情况下加装弹壳收集袋会比较安全。
RDB rifle is Kel-Tec company following the RFB rifles introduced after another torpedo, although the two somewhat similar shape, but the structure is very different. The RFB rifle is a front thrown shell, the structure is relatively complex, RDB rifle is used under the shell, the structure is relatively simple, both for left and right hand operation. RD in the name of the RDB rifle that under the cast shell, the cast shell window is located in the rear of the magazine, the bolt movement to the magazine before the cast shell, bolt stroke becomes longer, the length of the gun is also relatively increased. This throwing method for standing position shooting basically no effect, the face of lying position shooting, it will be easy to scald the arm, in which case the installation of the cartridge collection bag will be safer.