I had a Versapod bipod laying around so I decided to mount it to my 16" M4's handguards to mess around with at the range.

I came across this on their website.

It attaches to the bayonet lug instead of the handguards.  Will this make any difference in accuracy at all?

Here is a pic of the one on the gun now.
Big picture

Well, it won't make the rifle less accurate but it may change your current point of impact (POI - where the bullet hits) away from your current point of aim (POA - where the sights are pointing).

Almost anytime you attach something directly to the barrel it changes the way the barrel vibrates after a shot and affects where the downrange impact is. Those little barrel mounted flashlight rigs can change POI, so I wouldn't be surprised if this did.

However that is just a guess based on my past experience with similar accessories like bipods that clamp around the barrel or flashlight mounts. I haven't used that particular piece of gear so I couldn't say for sure.

Comprende amigo :)

Bipods should be mounted on freefloat tubes for  best effect.  A simple round one is like 50 bucks to 499.99 for the uber tac  ones.

Quoted: Bipods should be mounted on freefloat tubes for  best effect.  A simple round one is like 50 bucks to 499.99 for the uber tac  ones.

I like the plain jane look of the standard handguards, which is why I'm not going to free-float my M4.  The bipod isn't staying on.  It's easy as hell to take on and off, and will probably be off most of the time if the range I'm going to check out tomorrow has rests or a way for me to bag it/rest on a towel.  So other than the aimpoint on top of the carry handle, it's all plainly :)

The next AR will be free-floated without a doubt, unless I go the SP1 route