>>64659209
You can stick your dick in it and fuck the gun fulfilling the urges everyone here has

>>64659213
... I'm too small for that...

>>64659289
Try the barrel then

>>64659209
>>64659213
>>64659289
>>64659292
Fuck ya
mudda

Personal taste. I'm not a fan myself

What's with all the buttstock threads today

Can in some ways provide a certain extra consistency in your grip, which can in turn provide some extra consistency in your trigger pull. Compare to how the H&K PSG-1 has that big adjustable shelf on the bottom of its pistol grip, to ensure that you always get the same height and position when gripping it (you couldn't ever grip it too low).
See also some of those Olympic bullseye pistols with big blocky ergonomic grips.

These aren't make or break features or anything, but there's a logic in their design and they do actually fulfill their function, but they of course have their drawback too, like not being able to get a grip as quickly and as easily as more conventional rifle stocks and pistol grips.
Obviously, that's not the end of the world if it's supposed to be a competitive target rifle, but it wouldn't be worth it for something like an infantry rifle or machinegun, and there's a big subjective factor to all of this.