I love the long legs on the Javelin. It’s a great system for shooting quickly while seated or kneeling on steep slopes and over vegetation. I use it all the time and keep it on my pack for quick access. I have Spartan adaptors on all my bolt guns and gas guns. I like this set up way more than using trekking poles. I am faster with it and find it to be more stable, particularly when using my pack upright against my chest or under my right arm as a rear rest. I have never used the Javelin with the factory legs. If I’m going to shoot prone, it’s generally off a backpack or a molinator bag attached to my pack.
But my springbok head went in the garbage. I think it goes against everything I’ve ever learned about marksmanship and accuracy with rifles. The marketing information touts it for getting on target fast and particularly for being able to shoot up and down slopes. In actual practice, those weird angle shots require you to put pressure on the gun with your trigger hand to force the spring silicon head to where you want it. That makes your natural point of aim and good trigger control pretty much impossible. And then after the shot, the springy silicon head causes the bipod and the gun to bounce like a basketball, making spotting your shot through the scope harder and slowing recovery and follow-up shots. Honestly, I like Spartan as a company, but I do not understand why anyone would want to use the springbok.