Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
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If you search for "horn" and "deuce horn" and the like, you'll find a couple of decent threads about upgrading from the M-series air horns.
Don't use the built in search feature, go to google.com and type the following:
'searchquery site:steelsoldiers.com' where 'searchquery' is what you're...