Powertube springs?

[LFD92]

I have heard about these in the past, but nothing recently. Are there advantages to using the original Powertube springs as opposed to the Powertube spacers? I have a bag of 8 that I received in a parts kit from a Mag I bought.

Can these be used in an Xvalve w/ lvl 10?

I know they're "old school" and the original spacers, but why were they not used in the later produced mags?

Any help would be great. Thanks!

[Coralis]

They can not be used with the level 10.

The springs tended to get weak after time and could cause leaking issues either one will work fine but I believe the spacers are just one thing that once you get the right one installed you shouldnt have to worry about it for a long time or if you have alot of wear on your sear/bolt.

[athomas]

The powertube spacers replaced the springs because they offered a small amount of tuning ability to reduce bolt stick and give the trigger a more crisp feel. The springs worked well and lasted a long time between changes. Lots of people never noticed the difference in performance.