I have one of the new model prolines, the regular ol' m15 series does not come with the blowback feature, however they do have a functioning bolt catch.
Several of my teammates have the sportline models; and the body is not nearly as good quality as teh proline. Not worth the 150$ saved. CA released the sportline series to compete with the cheap clones on the market. The sportlines also do not have a functioning bolt catch, and the charging handle doesn't even open the dust cover.
If you want a quality gun, go with a proline m15a4.
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I change primaries like other people change socks.
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