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buffered
Phosphate-buffered saline (PBS) is a buffer solution (pH ~ 7.4) commonly used in biological research. It is a water-based salt solution containing disodium hydrogen phosphate, sodium chloride and, in some formulations, potassium chloride and potassium dihydrogen phosphate. The buffer helps to maintain a constant pH. The osmolarity and ion concentrations of the solutions are isotonic, meaning they match those of the human body.
This listing is for a soft mount for M240 or MAG-58, also M249 and anything with an adapter for those mount types. This is the military issue soft mount seen from the 2000's, I think this one is British. In very good condition, the anodizing has some wear but the springs and buffers are still...