StealthyBlagga 4 Posted November 6, 2013 Report Share Posted November 6, 2013 I have a stock MKA 1919 upper half that I want to upgrade to the High Energy Operating System. However, I really prefer to keep the original M16-style plastic handguard. Will the HEOS be a drop-in fit under that handguard, or do I need to switch to the Firebird handguard? Quote Link to post Share on other sites
Flatland Shooter 22 Posted November 10, 2013 Report Share Posted November 10, 2013 Just a bump. I'd like to know too. Actually any info on installing the HEOS would be appreciated. Quote Link to post Share on other sites
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