The M80 takes 1/4x20. I talked to someone at Axiom that told me the correct size.The whole set of 8 was only 47.60 usd with free shipping.There is no charge for shipping in the US and Canada.It took some time to find these, some of the spikes I found were alot more expensive.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud