Weaker than OEMDisclaimer: the one star is for the part only. TNA offers a great service and awesome customer service and I'm pleased to deal with TNA all the time. They are a 5 stars business.
Now the review:
I swapped the spring on my Norinco bolt and kept getting extraction issues. Empty casing left in the chamber or partially extracted.
Morale of the story: If it isn't broken, don't fix it !
Good productI thought these would enhance a SBR/pistol build. It can't hurt having these around.
WorksHad a reliability problem using steel case cheap Russian and Chinese ammo. In about 350 to 400rnds I would get continuous failures to extract if i wasnt keeping it wet with oil. I noticed i could easily move the extractor with my finger..too easy. I ordered these stronger springs put them in.. big difference. No more problems till many more ends have gone through. Also suggest you put in a doughnut in with these, no more moving the extractor easily with your finger now. Now it will chew through most any case like a demon.
Enhanced Power Extractor Spring
Similar to a standard mil-spec extractor spring except this one is extra stiff.
Recommended if you have a barrel 16" or longer, with a carbine length (9.75") gas system. The relatively shorter gas system on a longer barrel is harder on the extractor because the extraction cycle happens so fast.
Some companies offer an O-ring to prevent extractor bounce, but the rubber degrades over time, whereas this spring will last much longer being steel instead of rubber. Not recommended to use an O-ring with this spring due to overkill.
Using a stronger spring is also reported to help ensure successful extraction in these situations:
- shooting NATO pressure ammo from a dirty chamber
- shooting steel-cased ammo, where the case takes a longer time to shrink
This won't solve your overgassing issue, but if you like the gas level where it is and you simply want to guarantee ejection, a power spring can help.
Typically a Mil-Spec extractor spring will throw cases near 4 o'clock. This stronger spring throws them around 2-3 o'clock.
In general, springs are wear items and degrade over time so it is wise to keep one or two extractor springs of some kind in the toolbox.
- Ready to drop in and go
- Made by a military contractor
- Spring steel construction
- Weight: <1g
- 4mm tall
- One extractor spring
- All mil-spec bolts
- All mil-spec extractors
Tools required: None
Installation notes: Note the spring has a wider end. This wide end should be pressed into the cup in the Extractor.