You can choose between factory stems and delrin custom stems. The delrin stems will pop open easier giving more power.
The stem length on these is:
QB Chief Early Version 35mm
QB Chief II 31mm
QB78/79/AR2078/79 37.5mm
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i have beeman raider .22, asking if regulator from beeman cheif 2 would fit, did some forums and they said it would fit thanks
Sorry. For my late review. Order the valve stem for my dead (almost two year not working because of valve stem could find it) Beeman QB Chief now she is alive again ( shooting ). Thank you ,and Thank you. Without you my Beeman QB Chief Would be still resting in peace. Have buy from you and will continue to do so. 5*****
Do you have a replacement for the Beeman qb Chief,if not can you make it
yep you should see the option on the product page. Thanks,