I would recommend a tightbore barrel also. If you can afford it go with a higher end one (like Prometheus) but if you're cheap (like me!) go with a Madbull. Mine was like $35 from Jugglez (airsoftparts.ca) and it upped the FPS slightly and my groupingss were much tighter (m4 length). My first Madbull barrel was a dud (tephlon coating shredding immediately inside) but I received a new one right away for free with no troubles now and probably 5K + rounds through it. Great bang for buck, IMO.
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