Since you decided on the barrel length, I would go ahead and start the Form 1 now if you're going that route. You'll have 6 months to figure out what you're trying to get out of your rifle.
For lightweight build, I would recommend either the NSR or Troy Alpha rail. Last time I weighed some sights, the DD front and rears weighed less than my magpul sights. Ummm ... yeah that's all i got for now lol
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