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As originally introduced, the venerable A1/A2 configuration of the AR15/M16 features a fixed buttstock, integral carry handle, plastic handguard and an A-frame front sight. The recent surge in the popularity of optics have made the A4 flat-top variant popular with civilian, police and military operators alike.

upgrade2.jpgThe use of Picatinny railed handguards has dramatically increased with the proliferation of mission-specific accessories, such as forward vertical grips, lights, lasers and night-vision equipment. M4 carbines made collapsible stocks all the rage, and for good reason. But what do you do if your AR is evolutionarily challenged?

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As originally introduced, the venerable A1/A2 configuration of the AR15/M16 features a fixed buttstock, integral…