Both of those you are likely only going to find on the used market. King Arms and Action Army have some gas rifles that use the tanaka m700 system.
King Arms TWS Gas Bolt Action (M700)
Just got it. Stay tuned for impressions and tuning. Overall first impressions right out of the box. not as heavy as I was expecting, still on the hefty side as 90% of the rifle is metal. Originally I was not thrilled with the CAA stock on it, but that one in particular is not all that bad. I do...