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Things I liked: Endless Play
Things I would have changed: Make the battery A little wider and less thick to fit in M 16 and AR style stocks
What others should know: This battery does the job, If you plan to put this in a Echo 1 Stag that has a non retractable stock, you will need to cut a small section for your plug to enter the inside plug as this Battery is to big to fit in the stock and will need to be mounted to the outside of you rifle. Other Rifles with wide retractable stocks this should fit.