I recently acquired a DPMS sweet 16 upper with a stainless bull barrel in .223. From the factory this is set up for a scope. I would like to change out the .936 smooth factory gas block with a single Picatinny rail gas block. My goal is to add a Magpul MBUS front and rear sight on the Picatinny rail system. This will give me time to use the upper while I find the right optic system. Any suggestions/experience on the single rail gas block? Wanna kill these ads? We can help!