Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: is the aperature removable so the rear sight can be used as a ghost ring? thanks
Document: I'm afraid to tighten the rear peep too much since it feels like powder coated aluminum, and I don't want to Loctite it since occasionally I use the ghost ring created by it's removal.
I used the rear peep to replace the rear sight on my rio grande and it works perfect. Best upgrade you can do for your rifle as far as I am concerned.
Installed this sight set on my 336A. Installation was very easy. I received 2 front sights with different size dovetails. I filed the base of the front sight for my rifle just a bit at a time until I was able to get it started into the dovetail with my soft hammer, then used a punch to center. Rear sight was very simple, just two screws on top of reciever. That was it! Sight picture looks great, 10x better than stock buckhorn sights.
each hash is 1&#34; at 100yds) just something to let you know where you started from so you can adjust without too much guessing. The index marks are already on the elevation ramp, just put it on the windage plate too! Some type of tension on the rear sight would be cool too, that way it doesn't just slip all over when you're trying to make adjustments.
Not a fan of the notch rear/bead front combo that is stock on the 336W that i use as my brush gun. Especially when you are going after game that blends into the background. Putting a scope on a lever gun is ridiculous if you ask me, so that wasn't going to happen. Looked at a couple different options and went with the firesight.Installation was easy, two screws on the rear sight. The front sight was perfectly sized.
I put this on my Marlin 336. Due to my aging eyesight I was having trouble using the factory sights. The peep allows me to pick up the red front ramp easily. I installed the rear sight myself but the front required me to take it to my local gun shop to tap out the old sight and put the new one on. I just didn't have the proper tools at home and it was only $5 to get it done.
Adjustments are not click type. You loosen the adjustments screws and slide horizontally and/or vertically. There are vertical lines for reference but no horizontal lines. Once i'm sighted in I dont adjust so i'm ok with it. Contrary to other reviews I have seen you do not need to remove the aperture ring to make adjustments. Range trip this weekend! 5 STARS for installation, initial impression, & price
Took it to the range shooting 160 grain 30-30 LEVERevolution from Hornady. Easy to pick up the front sight, easy to index on target, nice tight groups because of the consistent sight picture.The bad. The rear sight is adjustable for both windage and elevation, but only the ELEVATION has index marks. WTF? Why couldn't they put simple index marks for windage? What makes it even more difficult is that the tensioner screw for windage is either in or out.
I bought these for my Marlin 336GBL in 30-30. I installed the front sight first, since it required the most work. After about 15 minutes with a wood dowel and hammer, I was able to get it centered on the rifle. The rear sight installation was a breeze, requiring the removal of two screws from the receiver and mounting the sight.The front sight is bright and clear, and the rear peep sight accentuates it nicely.
The product was of the high quality expected from Williams. The sight package was easy to install and fuctioned very well. I would recommend this package to anyone who is considering installing apeture sights on their Marlin 336C rifle.
Answer: yes