The X-Fire SPR II bolt-action springs currently being tested against other brands have been quite interesting to say the least. With all the bolts that were tested doing a full write up, but because of space and time considerations, I'll just summarize the results of the SPR-II springs and why I think they're an ideal choice!!

Testing and Results
Being the person that I am I needed to order all the parts from Japan, which saves me the hassle of having to wait for someone to bring it in! So I went ahead and bought 4 types of springs. The SPR-II springs that I’m using come in all sorts of power types - 0.9 joule, 1 joule, 1.2 joules, etc. ASH has a 450fps cap on all bolt action rifles so, finding the right set up is a must. By choosing one out of the four springs (the 1.4 joule) I’ve put my gun at or around the field limit. Thinking the 1.99 joules spring I initially bought for the gun was supposed to bring my gun to 450fps turned out to be a big error. The actual result was up around 525-530fps! Choosing a spring from X-Fire should be done with caution because they shoot a lot stronger than other brands. You should pick one that is lower powered than what you think you need.

The best part of using X-Fire springs is that no matter how high the fps, the pull of the bolt is still relatively soft. Its Linear design helps the pull and still maintains its strength. Also, a softer pull relieves some of the stress on the handle boss which in turn will give it a longer life span. Shot consistency is also a really big factor when using a bolt-action rifle. The idea is to have it shoot with little to no change in velocity from shot to shot. This improves the shooter’s accuracy.

Overall, I hope this review will give the readers out there a different perspective on how a spring can make a really big difference on your bolt-action rifle. I recommend using X-Fire springs to give your bolt-action rifle better reliability, performance, and to prolong its life. If you would like to pick up the spring described in this article or other springs that X-Fire has to offer, please come by and see the guys over at Impact Games!

Note from Tyler
In regards to high power upgrades for bolt-action guns, I have to agree. I'm currently experimenting with a SPR II 1.99J spring in a modified VSR. Velocities have consistently exceeded any spring from Laylax, with the bonus of a very soft bolt pull. I'm still using a sp150 PSS10 spring in my G-Spec for ASH games. Although SPR II springs are a little confusing in their power output labels, they do deserve a closer look. You can find a wide selection of Bolt -action parts for both the VSR and APS, as well as gun tuning from Impact Games.