-It's stubby, so I experienced reduced kick
-Quality of tip has yet to be seen
-Must be lubed
-May reduce efficiency
Well this is the first Blind Bolt review, so it might as well be in-depth.
Well my B2K3 does not have PDS, so despite using a Halo I am always looking for cheap ways to reduce my risk of chopping. So I bought one of these. It cost me $35 shipped.
The back part of the bolt is made of some kind of black plastic. It is stubby and has plenty of plastic cut out of the body to reduce weight, size, and friction. The tip of the bolt is a red piece of rubber that is attatched to the plastic section of the bolt with an adhesive. The rubber part of the bolt is hollow, providing the bolt with a very large open face. This rubber is supposed to cushion the ball to prevent it from chopping. Overall the bolt is 3 5/16 inches long, about 2 inches shorter than the stock bolt.
When I tried to put the bolt in my gun, it wouldnt fit. There is a lip on the tip of the rubber piece that is supposed to prevent blowback, and it was intentionally made too big so that you can sand it down and get the perfect fit for your gun, similar to how Halo feednecks are intentionally too big. The rest of the bolt is the perfect size. I sanded the lip down until it was the right size to fit in my gun.
I just did a chrono test to see how the Blind Bolt affects the velocity of my gun. With the stock bolt I shot between 294fps and 303fps. I lubed the Blind Bolt with some Shocker lube, and it got between 280 and 290. So expect about a 10 to 15fps drop in your velocity with this bolt.
My gun also has slightly less kick with this bolt. This is probly because it is a stubby bolt.
I had 2 problems with this bolt. One was this. The front is a touch longer than the front of the stock bolt. This is probly to prevent paintballs from rolling backward in the chamber. With smaller bore paint, this worked very well. But then I tried some very large bore paint, it measured about .693 or .694. My gun was skipping every other shot. I took off my hopper and fed paint into the feedneck by hand. I would drop a ball in the feedeck, but it would get stuck because the bolt was so long in front that it partially blocked the paintball from entering the chamber. Keep in mind, this only happened with very large paint. So I sanded down the front of the bolt a bit to make it a little shorter and about 2 minutes later it worked fine.
My other problem was that the lip on the front of the bolt shot out my detents. There are two slots on the sides of the bolt, similar to the stock bolt, so that the detents dont rub against it. But they are behind the lip. So the lip on the bolt was just big enough to "grab" the o-ring detents and shoot them out. I just got 2 new o-rings, did the macroline mod, and they work perfectly now.
Some ppl have brought the strength of the adhesive that connects the rubber tip to the plastic bolt into question. Mine is working fine, but I have only had the bolt for about 2 weeks. If my rubber tip comes off I will edit this review. If this turns out to be a problem then I am sure OTB will take care of it.
So the bolt's overall performance exceeded my expectations. But I had to fiddle with it a bit before it worked perfectly. Of course sanding it to the correct bore size was expected, but my other two problems were not. Still, no big deal, they were easily corrected.
This is not a bolt that you can just put in your gun have it work. You have to do some sanding, and strengthening your detents is a good idea. But if you dont mind doing that, then this bolt is a very good (and cheap) anti-chop upgrade. combined with my Halo I have had zero chops. Although the Blind Bolt cannot prevent 99.9% of chops like PDS does, it certaintly does a good job. Anyone who cant afford PDS should get this, its a very low-cost alternative. I give a 9 because despite exceeding my expectations in terms of performance, it took a little bit of effort to get it to work that way. Also, I am holding out hope that the adhesive lasts awhile, but that has yet to be seen. Still, OTB backs their products so if it breaks they will probly help me out.
Edit: I've been using this bolt for a little over 2 and a half months now. I play every weekend, and I have yet to chop. The tip is still holding up just fine.
9 out of 10
Last edited on Wednesday, October 13th, 2004 at 8:59 am PST