I recently purchased a Hunter Special 410. It has a wood pistol grip. Can anyone tell me it this is an aftermarktet addition or could it have been a factory option when the gun was made. It's a 1938 model.

http://pics.gunbroker.com/GB/258195000/258195129/pix219122212.jpg

http://pics.gunbroker.com/GB/258195000/258195129/pix985486909.jpg

http://pics.gunbroker.com/GB/258195000/258195129/pix692034582.jpg