Well Yes and No. Let me explain. In the USA there is no limit on The power of an air rifle so a strong spring is used. In other countries, like Canada, there is a limit on the power an air rifle, so a different spring is used that produces less power. Normally you do not want to tamper with the design of an air rifle because it could cause damage to other parts of the rifle that may not be able to handle the change in design.
Crosman makes about 50 different '''RIFLES''' you need to state the model you are asking about. See the link below for Crosman rifle owners manuals
Contact Crossman or one of their repair centers.
There are at least 10 different Crosman Revelation models. Which one are you asking about?
Crosman had made over 100 different models. It would help if you stated the model you want to reassemble.
The Crosman 140 Air Rifle was made from 1954 to 1968 in four different variations. Crosman no longer makes parts for the rifle but you can still get it repaired. The Crosman home page offers a "Find a repair center" button on their first page. From there you can locate a center that has parts for your rifle. See the related link.
Crosman made over 10 different models of the Revelation brand for Western auto. Please state the model number AND condition of the rifle to get an estimate of value.
See the CROSMAN Link below.
See the link below for the Owners Manual for the Crosman 1077 air rifle
If you are asking about a Crosman air rifle / gun. There are over 50 different models made over the years. State the model and the condition of the gun and you might get an answer.
I had to go look at my Quest 1000x and could not find any hole in the sight, but my Quest is about 4 years old and Crosman may have added it to yours. Usually a sight with a small hole is called a peep sight. I have a notch sight on my rifle. The only other hole on top of the rifle is towards the back of the barrel and that is a Scope stop. Some scopes have a pin on the bottom pf the scope mount to place in the hole, this keeps the scope from moving when the rifle fires.
Crosman still has parts for this rifle. contact Crosman at the link below (Customer service) and order the parts you need.
Crosman has the parts diagram online. There were 3 different versions. See the link below for the first version. http://www.crosman.com/pdf/manuals/crosman/766/C766-EVP1.pdf